![]() | This ![]() It is of interest to the following WikiProjects: | ||||||||||
|
![]() | This article links to one or more target anchors that no longer exist.
Please help fix the broken anchors. You can remove this template after fixing the problems. |
Reporting errors |
In the Nomenclature section, under inorganic esters, there are 2 intern links to the same article I guess ( borinic esters and boronic esters), but one is wrong typed... OR it must be another unexisting article, I don't know. I don't understand how to fix that problem. Thanks for your help Tithee.lefebvre ( talk) 09:43, 31 May 2020 (UTC)
The first sentence states that esters require a carbonyl, and the article later discusses consequent bond angle implications. This seems like a contradiction. Can it be addressed more directly? — Preceding unsigned comment added by 128.112.160.140 ( talk) 19:57, 16 February 2014 (UTC)
Clarified RomanHunt ( talk) 06:37, 29 June 2014 (UTC)
Still confusing in 2017 : Article says "Esters contain a carbonyl center" but elsewhere it makes it sound like that only applies to carboxylate esters. - Rod57 ( talk) 10:12, 5 February 2018 (UTC)
I'm not sure, but i guess 'Esters are more polar than ethers but less polar than alcohols' should be replaced by 'Esters are more polar than acids but less polar than alcohols' ? — Preceding unsigned comment added by 121.1.55.84 ( talk) 00:57, 2 October 2013 (UTC)
Do we indeed really need to mention a whole list of esters? The chemistry section is much more important. There are not even mechanisms in there that explain the acid cat. ester formation! Sikkema 12:30, 20 July 2007 (UTC)
I think the ester_compound page should be moved back here. The other pages are not as important as the chemistry one, except for the ester, alaska one but a note at the top of the page would suffice for that. Ester final fantasy is trivial and esther i the bible is not even the same spelling. Its not called an ester compound anyway, if anything it should just be ester (chemistry). Borb 08:28, 6 May 2005 (UTC)
I think the list is a great idea. I just recently ran into an unknown ester where all I had to go on is the smell, and this list was a good reference. Just saying. -Courtney —Preceding unsigned comment added by 69.152.216.24 ( talk) 22:10, 9 June 2010 (UTC)
It might do to describe which isomer of the pentyl radicals are refered to in some of the esters given.
odors, and that different optical isomers of odorants/flavorants (eg, carvone) lead to distinguishable odors, I would be *very* surprised if there were not also a dependency on pentyl chain isomerism.
Could anyone explain how the term mono-ester and di-ester is used?
I was frustrated by the lack of information on the chemical properties of esters. Are the reactions listed the only ones that it usually goes through? Could someone please post more information?
yes, the ester content did move to ester compound because other ester (esther) definitions started to pop up. feel free though to revert this edit back to the original but please consider a solution for the other definitions.
I started researching the net to verify that methyl butanoate and ethyl butanoate both have a pineapple smell. Here is what I found up this time:
Based on these findings and for consistency with the rest of Wikipedia, I edited the list under the Physicals section of the Ester article to state the methyl butanoate smells of pineapple or apple and ethyl butanoate smells of pineapple. It's certainly possible for very similar compounds to have similar smells. A pineapple does not necessarily have to be flavored with only a single compound. H Padleckas 16:37, 17 July 2005 (UTC)
It might be easier if you had links that actually showed the structure.—Preceding unsigned comment added by 65.27.132.105 ( talk)
"Esters are a class of chemical compounds and functional groups."
This definition is unsat. Needs to distinguish esters from other chem compounds and functional groups.
Norm
If anyone has the rules handy (I don't right now), a description of the IUPAC method for naming esters would be handy. 24.118.220.84 06:36, 5 May 2004 (UTC)
There has just (22-23 Nov 2009) been a flurry of changes to the nomenclature example - hexyl octanoate. I think these may have been triggered by the long-standing mis-link, which, although to the correct acid - caprylic acid (C8), was labeled as "caproate", which referes to caproic acid (C6). I have changed the label from "caproic" to "caprylic", and returned the formula to the standard form, as described in the following paragraph in the main article, with the acid, terminating in CO2, followed by the alcohol (which reverses the order in the name, adding to the confusion). FredV ( talk) 16:27, 23 November 2009 (UTC)
![]() | This article may be too technical for most readers to understand.(September 2010) |
Hey, the last paragraph of the intro had some good layman info. I'm moving it up to the front and simplifying it.
ok so now the intro is like: esters=important. several layman examples: dna, nitroglycerin, poly-ester (bells ring in head). Then, slightly more technical description. Then etymology. Then the really technical description, which I mostly didn't touch. How's that? How does the 'too technical' banner get removed?
Guidelines say that the first parag of intro should 'define' and set scope of word. I know that listing several examples of an 'important compound' is a poor substitute, but I couldn't come up with a nontechnical way to say it all without introducing more technical terms like 'alcohol' (you mean like booze?) or 'acid' (you mean like LSD?).
OsamaBinLogin ( talk) 20:38, 15 March 2009 (UTC)
It looks like someone moved it back. The term "fatty acid esters of glycerol" does not tell me how fatty acids relate to glycerol - they are totally different, glycerol has a higher oxygen ratio and is shorter, for example. will have to look elsewhere. Triglyceride seems to provide a little more information Charlieb000 ( talk) 02:54, 19 May 2013 (UTC)
I started cleaning up the big table. In particular, I made it sortable and added images and molar masses. It would be interesting to also have the NFPA 704 health, flammability, and reactivity numbers as their own (sortable) column. —Ben FrantzDale 22:13, 13 May 2007 (UTC)
Red/blue/yellow diamond shapes do not display properly in all browsers. They could be replaced with a similar symbol from under the edit box, but the size would have to be specified as well. For example:
Svemir 14:28, 16 May 2007 (UTC)
This article is too vague for those with little chemistry knowledge. The introduction doesn't explicitly explain what an ester is in terms of what atom connects to what. The introduction is poorly written--it merely lists the types of esters out there. Too much details but no actual description of what an ester is specifically. (Compare this article to the Carbonyl article. The other article's first sentence concretely tells about the atom-atom connections: "In organic chemistry, a carbonyl group is a functional group composed of a carbon atom double-bonded to an oxygen atom : C=O. 199.76.186.8 03:55, 8 September 2007 (UTC)
No. 199.76.186.8 03:55, 29 July 2020 (UTC) — Preceding unsigned comment added by 2A01:388:26C:150:0:0:1:67 ( talk)
The first sentence currently starts "An ester is a chemical compound derived from an acid (organic or inorganic) in which at least one –OH hydroxyl group is replaced by an –O– alkyl (alkoxy) group". I find this to be confusing because my mind immediately tries to take an inorganic acid (HCl specifically) and figure out how to replace a hydroxyl group. I would find the article to be more helpful if the definition at the beginning was based on what atomic structure is required for an ester and had information about how they were derived as part of the second sentence. Mirriam Webster provides a pretty clear definition that could be used a template [1]. I also don't understand how an ester could be derived by replacing the H in a hydroxyl group with an alkyl group if the base acid is inorganic. I'm under the impression that it needs to start with a carboxylic acid. A possible rewrite would be, "An ester is a chemical compound than contains an –OR (alkoxy) group attached to a carbonyl (C=O). Esters are often derived by replacing an -OH group in carboxylic acid with an -OR group." 76.115.127.95 ( talk) 03:35, 30 December 2021 (UTC)
This is just to say thankyou to those who edit and make sure this and related articles are acurate and easy to understand, as I'm sure you realise many students such as myslef go to chemistry articles like this to learn. Thank you. —Preceding unsigned comment added by 217.35.93.92 ( talk) 19:39, 19 March 2008 (UTC)
According to Twenty First Century Science GCSE Chemistry (ISBN: 978-0-19-915050-2), pineapple contains 120mg/kg of ethyl ethanoate (or ethyl acetate as in this article). Should pineapple be included in the table of odours for ethyl acetate? Leonini ( talk) 11:55, 22 May 2008 (UTC)
I must say that I don't remember too much from my college chem courses, but do alot of acids have OH groups? I thought that's what made a base. Smack me if I'm wrong. Alex T 69.122.62.231 ( talk) 02:28, 29 May 2008 (UTC)
What is a half ester? If this is the place to explain, someone please go ahead.
Thanks, ...
PeterEasthope (
talk)
22:13, 17 November 2008 (UTC)
I am revising the article following the outline in the Chem manual of style. Large chunks will be moved around. This particular piece seems out of place somehow, sort of a game on who can name high-order oligoesters. For an overview, these species seem to be rather specializes, but I did not want to unilaterally discard this info. I retained (and will expand) the triester bit, since the triglycerides are so broadly important.-- Smokefoot ( talk) 05:39, 27 August 2009 (UTC)
Polyester polymer containing a small number of component esters.
Tetraesters can be found as part of membrane-spanning lipids in bacteria from the order Thermotogales. [2]
Hexaesters such as calix[6]arene have been used in optodes as sensing devices for optical determination of potassium ion concentration in pH-buffer solutions. [3]
Heptaesters have been found in Euphorbia species. [4]
Octaesters can be inclusions of ester moieties within cavitand cavities. [5]
The number of esters can be up to ten as in oligo-(R)-3-hydroxybutyrate [6].
References
{{
cite journal}}
: Unknown parameter |month=
ignored (
help)CS1 maint: multiple names: authors list (
link)
{{
cite journal}}
: Unknown parameter |month=
ignored (
help)CS1 maint: multiple names: authors list (
link)
{{
cite journal}}
: Unknown parameter |month=
ignored (
help)CS1 maint: multiple names: authors list (
link)
{{
cite journal}}
: Unknown parameter |month=
ignored (
help)
{{
cite journal}}
: Unknown parameter |month=
ignored (
help)CS1 maint: multiple names: authors list (
link)
I think that this merge should be noncontroversial. Under the manual of style for functional groups, the article ester is required to have a section on their preparation. The main method for their preparation is esterification, so it seems that this as a separate article should be blended with this one. Ideas welcome.-- Smokefoot ( talk) 03:17, 7 November 2010 (UTC)
Don't think it's controversial either. We have lots of material in ester already, I think you can just salvage whatever has not already been mentioned here from esterification, and redirect it here. -- Rifleman 82 ( talk) 04:05, 7 November 2010 (UTC)
The Table in Appendix A that provides a list of Ethers has one column labeled "Odor or occurrence" which makes the listing of substances ambiguous as to whether the ether smells like the substance or is found as a component of the substance. Alchemy Heels I ( talk) 18:50, 24 November 2010 (UTC)
Thanks for the great article. I was however looking for a toxicity topic and did not see it (did I miss it?). Specifically with regards to alcoholic beverages, someone once told me that a reason for maturing spirits using oak wood is because undesirable (toxic?) esters will either evaporate through the oak microscopic pores or complete their chemical transformation into alcohol over the maturation period. Is this true? — Preceding unsigned comment added by Robertoff ( talk • contribs) 02:34, 21 July 2012 (UTC)
In
this edit a contradiction is claimed by
Anypodetos, i.e. "The first sentence only includes carboxylates, while the next two include derivatives of any oxo acid. The ref (Gold Book also includes thioesters etc.)
," but I don't see it. I am not an expert so I may have misunderstood - please explain. The first sentence (referenced in the claim) does not refer to a carboxylic acid at all; rather, it refers to a
carbonyl group, which does not assume that the carbonyl came from a carboxylic acid (i.e. it could come from an oxoacid, which is what the next two sentences specify). --
Scray (
talk)
20:39, 11 December 2013 (UTC)
Just a request - I think the article, especially the preparation section, needs more structures instead of inline molecular formulas. It would increase the readability a lot. OxygenBlue ( talk) 21:55, 16 December 2013 (UTC)
This lede had been bothering me for awhile. I made 3 changes. For me, it's a great improvement, but I have two questions.
(1) New version: Usually, esters are derived from a carboxylic acid and an alcohol.
Should it be "usually" or "often"? Or qualified with "organic" or something?
(2) New version: Esters comprise most naturally occurring fats and oils. An important case are glycerides, which are fatty acid esters of glycerol.
Would "triglycerides" match better than "glycerides" with naturally occurring fats and oils?
What really is the relationship between "naturally occurring fats and oils", and various glycerides? Is it overlap, inclusion in one direction or another, or synonymy?
I apologize for editing (2) without knowing the relationship. But the prior version was esters comprise most naturally occurring fats and oils, which are fatty acid esters of glycerol. This is confusing, perhaps even self-contradictory. Does it say "esters encompass most fatty acid esters of glycerol" or "esters account for most fatty acid esters of glycerol"? In any case, it seems to contain a definition and an empirical statement about prevalence wrapped up too closely together.
The word "comprise" can be problematic, unless the direction of inclusion is crystal-clear from context. The word is truly ambiguous as to what is a subset of what !! By Google:
(1) Consist of; be made up of. "The country comprises twenty states." Synonyms: consist of, be made up of, be composed of, contain, encompass, incorporate.
(2) Make up; constitute. "This single breed comprises 50 percent of the Swiss cattle population." "This breed comprises half the herd". Synonyms: make up, constitute, form, compose; account for.
Remarkably, neither reading seems to function correctly in the original version of (2). 89.217.9.188 ( talk) 02:44, 17 January 2015 (UTC)
Hello fellow Wikipedians,
I have just modified one external link on Ester. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
This message was posted before February 2018.
After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than
regular verification using the archive tool instructions below. Editors
have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
RfC before doing mass systematic removals. This message is updated dynamically through the template {{
source check}}
(last update: 5 June 2024).
Cheers.— InternetArchiveBot ( Report bug) 21:52, 23 September 2017 (UTC)
Please help with physical science am in grade 11 — Preceding unsigned comment added by 197.254.161.145 ( talk) 06:59, 6 September 2022 (UTC)
![]() | This ![]() It is of interest to the following WikiProjects: | ||||||||||
|
![]() | This article links to one or more target anchors that no longer exist.
Please help fix the broken anchors. You can remove this template after fixing the problems. |
Reporting errors |
In the Nomenclature section, under inorganic esters, there are 2 intern links to the same article I guess ( borinic esters and boronic esters), but one is wrong typed... OR it must be another unexisting article, I don't know. I don't understand how to fix that problem. Thanks for your help Tithee.lefebvre ( talk) 09:43, 31 May 2020 (UTC)
The first sentence states that esters require a carbonyl, and the article later discusses consequent bond angle implications. This seems like a contradiction. Can it be addressed more directly? — Preceding unsigned comment added by 128.112.160.140 ( talk) 19:57, 16 February 2014 (UTC)
Clarified RomanHunt ( talk) 06:37, 29 June 2014 (UTC)
Still confusing in 2017 : Article says "Esters contain a carbonyl center" but elsewhere it makes it sound like that only applies to carboxylate esters. - Rod57 ( talk) 10:12, 5 February 2018 (UTC)
I'm not sure, but i guess 'Esters are more polar than ethers but less polar than alcohols' should be replaced by 'Esters are more polar than acids but less polar than alcohols' ? — Preceding unsigned comment added by 121.1.55.84 ( talk) 00:57, 2 October 2013 (UTC)
Do we indeed really need to mention a whole list of esters? The chemistry section is much more important. There are not even mechanisms in there that explain the acid cat. ester formation! Sikkema 12:30, 20 July 2007 (UTC)
I think the ester_compound page should be moved back here. The other pages are not as important as the chemistry one, except for the ester, alaska one but a note at the top of the page would suffice for that. Ester final fantasy is trivial and esther i the bible is not even the same spelling. Its not called an ester compound anyway, if anything it should just be ester (chemistry). Borb 08:28, 6 May 2005 (UTC)
I think the list is a great idea. I just recently ran into an unknown ester where all I had to go on is the smell, and this list was a good reference. Just saying. -Courtney —Preceding unsigned comment added by 69.152.216.24 ( talk) 22:10, 9 June 2010 (UTC)
It might do to describe which isomer of the pentyl radicals are refered to in some of the esters given.
odors, and that different optical isomers of odorants/flavorants (eg, carvone) lead to distinguishable odors, I would be *very* surprised if there were not also a dependency on pentyl chain isomerism.
Could anyone explain how the term mono-ester and di-ester is used?
I was frustrated by the lack of information on the chemical properties of esters. Are the reactions listed the only ones that it usually goes through? Could someone please post more information?
yes, the ester content did move to ester compound because other ester (esther) definitions started to pop up. feel free though to revert this edit back to the original but please consider a solution for the other definitions.
I started researching the net to verify that methyl butanoate and ethyl butanoate both have a pineapple smell. Here is what I found up this time:
Based on these findings and for consistency with the rest of Wikipedia, I edited the list under the Physicals section of the Ester article to state the methyl butanoate smells of pineapple or apple and ethyl butanoate smells of pineapple. It's certainly possible for very similar compounds to have similar smells. A pineapple does not necessarily have to be flavored with only a single compound. H Padleckas 16:37, 17 July 2005 (UTC)
It might be easier if you had links that actually showed the structure.—Preceding unsigned comment added by 65.27.132.105 ( talk)
"Esters are a class of chemical compounds and functional groups."
This definition is unsat. Needs to distinguish esters from other chem compounds and functional groups.
Norm
If anyone has the rules handy (I don't right now), a description of the IUPAC method for naming esters would be handy. 24.118.220.84 06:36, 5 May 2004 (UTC)
There has just (22-23 Nov 2009) been a flurry of changes to the nomenclature example - hexyl octanoate. I think these may have been triggered by the long-standing mis-link, which, although to the correct acid - caprylic acid (C8), was labeled as "caproate", which referes to caproic acid (C6). I have changed the label from "caproic" to "caprylic", and returned the formula to the standard form, as described in the following paragraph in the main article, with the acid, terminating in CO2, followed by the alcohol (which reverses the order in the name, adding to the confusion). FredV ( talk) 16:27, 23 November 2009 (UTC)
![]() | This article may be too technical for most readers to understand.(September 2010) |
Hey, the last paragraph of the intro had some good layman info. I'm moving it up to the front and simplifying it.
ok so now the intro is like: esters=important. several layman examples: dna, nitroglycerin, poly-ester (bells ring in head). Then, slightly more technical description. Then etymology. Then the really technical description, which I mostly didn't touch. How's that? How does the 'too technical' banner get removed?
Guidelines say that the first parag of intro should 'define' and set scope of word. I know that listing several examples of an 'important compound' is a poor substitute, but I couldn't come up with a nontechnical way to say it all without introducing more technical terms like 'alcohol' (you mean like booze?) or 'acid' (you mean like LSD?).
OsamaBinLogin ( talk) 20:38, 15 March 2009 (UTC)
It looks like someone moved it back. The term "fatty acid esters of glycerol" does not tell me how fatty acids relate to glycerol - they are totally different, glycerol has a higher oxygen ratio and is shorter, for example. will have to look elsewhere. Triglyceride seems to provide a little more information Charlieb000 ( talk) 02:54, 19 May 2013 (UTC)
I started cleaning up the big table. In particular, I made it sortable and added images and molar masses. It would be interesting to also have the NFPA 704 health, flammability, and reactivity numbers as their own (sortable) column. —Ben FrantzDale 22:13, 13 May 2007 (UTC)
Red/blue/yellow diamond shapes do not display properly in all browsers. They could be replaced with a similar symbol from under the edit box, but the size would have to be specified as well. For example:
Svemir 14:28, 16 May 2007 (UTC)
This article is too vague for those with little chemistry knowledge. The introduction doesn't explicitly explain what an ester is in terms of what atom connects to what. The introduction is poorly written--it merely lists the types of esters out there. Too much details but no actual description of what an ester is specifically. (Compare this article to the Carbonyl article. The other article's first sentence concretely tells about the atom-atom connections: "In organic chemistry, a carbonyl group is a functional group composed of a carbon atom double-bonded to an oxygen atom : C=O. 199.76.186.8 03:55, 8 September 2007 (UTC)
No. 199.76.186.8 03:55, 29 July 2020 (UTC) — Preceding unsigned comment added by 2A01:388:26C:150:0:0:1:67 ( talk)
The first sentence currently starts "An ester is a chemical compound derived from an acid (organic or inorganic) in which at least one –OH hydroxyl group is replaced by an –O– alkyl (alkoxy) group". I find this to be confusing because my mind immediately tries to take an inorganic acid (HCl specifically) and figure out how to replace a hydroxyl group. I would find the article to be more helpful if the definition at the beginning was based on what atomic structure is required for an ester and had information about how they were derived as part of the second sentence. Mirriam Webster provides a pretty clear definition that could be used a template [1]. I also don't understand how an ester could be derived by replacing the H in a hydroxyl group with an alkyl group if the base acid is inorganic. I'm under the impression that it needs to start with a carboxylic acid. A possible rewrite would be, "An ester is a chemical compound than contains an –OR (alkoxy) group attached to a carbonyl (C=O). Esters are often derived by replacing an -OH group in carboxylic acid with an -OR group." 76.115.127.95 ( talk) 03:35, 30 December 2021 (UTC)
This is just to say thankyou to those who edit and make sure this and related articles are acurate and easy to understand, as I'm sure you realise many students such as myslef go to chemistry articles like this to learn. Thank you. —Preceding unsigned comment added by 217.35.93.92 ( talk) 19:39, 19 March 2008 (UTC)
According to Twenty First Century Science GCSE Chemistry (ISBN: 978-0-19-915050-2), pineapple contains 120mg/kg of ethyl ethanoate (or ethyl acetate as in this article). Should pineapple be included in the table of odours for ethyl acetate? Leonini ( talk) 11:55, 22 May 2008 (UTC)
I must say that I don't remember too much from my college chem courses, but do alot of acids have OH groups? I thought that's what made a base. Smack me if I'm wrong. Alex T 69.122.62.231 ( talk) 02:28, 29 May 2008 (UTC)
What is a half ester? If this is the place to explain, someone please go ahead.
Thanks, ...
PeterEasthope (
talk)
22:13, 17 November 2008 (UTC)
I am revising the article following the outline in the Chem manual of style. Large chunks will be moved around. This particular piece seems out of place somehow, sort of a game on who can name high-order oligoesters. For an overview, these species seem to be rather specializes, but I did not want to unilaterally discard this info. I retained (and will expand) the triester bit, since the triglycerides are so broadly important.-- Smokefoot ( talk) 05:39, 27 August 2009 (UTC)
Polyester polymer containing a small number of component esters.
Tetraesters can be found as part of membrane-spanning lipids in bacteria from the order Thermotogales. [2]
Hexaesters such as calix[6]arene have been used in optodes as sensing devices for optical determination of potassium ion concentration in pH-buffer solutions. [3]
Heptaesters have been found in Euphorbia species. [4]
Octaesters can be inclusions of ester moieties within cavitand cavities. [5]
The number of esters can be up to ten as in oligo-(R)-3-hydroxybutyrate [6].
References
{{
cite journal}}
: Unknown parameter |month=
ignored (
help)CS1 maint: multiple names: authors list (
link)
{{
cite journal}}
: Unknown parameter |month=
ignored (
help)CS1 maint: multiple names: authors list (
link)
{{
cite journal}}
: Unknown parameter |month=
ignored (
help)CS1 maint: multiple names: authors list (
link)
{{
cite journal}}
: Unknown parameter |month=
ignored (
help)
{{
cite journal}}
: Unknown parameter |month=
ignored (
help)CS1 maint: multiple names: authors list (
link)
I think that this merge should be noncontroversial. Under the manual of style for functional groups, the article ester is required to have a section on their preparation. The main method for their preparation is esterification, so it seems that this as a separate article should be blended with this one. Ideas welcome.-- Smokefoot ( talk) 03:17, 7 November 2010 (UTC)
Don't think it's controversial either. We have lots of material in ester already, I think you can just salvage whatever has not already been mentioned here from esterification, and redirect it here. -- Rifleman 82 ( talk) 04:05, 7 November 2010 (UTC)
The Table in Appendix A that provides a list of Ethers has one column labeled "Odor or occurrence" which makes the listing of substances ambiguous as to whether the ether smells like the substance or is found as a component of the substance. Alchemy Heels I ( talk) 18:50, 24 November 2010 (UTC)
Thanks for the great article. I was however looking for a toxicity topic and did not see it (did I miss it?). Specifically with regards to alcoholic beverages, someone once told me that a reason for maturing spirits using oak wood is because undesirable (toxic?) esters will either evaporate through the oak microscopic pores or complete their chemical transformation into alcohol over the maturation period. Is this true? — Preceding unsigned comment added by Robertoff ( talk • contribs) 02:34, 21 July 2012 (UTC)
In
this edit a contradiction is claimed by
Anypodetos, i.e. "The first sentence only includes carboxylates, while the next two include derivatives of any oxo acid. The ref (Gold Book also includes thioesters etc.)
," but I don't see it. I am not an expert so I may have misunderstood - please explain. The first sentence (referenced in the claim) does not refer to a carboxylic acid at all; rather, it refers to a
carbonyl group, which does not assume that the carbonyl came from a carboxylic acid (i.e. it could come from an oxoacid, which is what the next two sentences specify). --
Scray (
talk)
20:39, 11 December 2013 (UTC)
Just a request - I think the article, especially the preparation section, needs more structures instead of inline molecular formulas. It would increase the readability a lot. OxygenBlue ( talk) 21:55, 16 December 2013 (UTC)
This lede had been bothering me for awhile. I made 3 changes. For me, it's a great improvement, but I have two questions.
(1) New version: Usually, esters are derived from a carboxylic acid and an alcohol.
Should it be "usually" or "often"? Or qualified with "organic" or something?
(2) New version: Esters comprise most naturally occurring fats and oils. An important case are glycerides, which are fatty acid esters of glycerol.
Would "triglycerides" match better than "glycerides" with naturally occurring fats and oils?
What really is the relationship between "naturally occurring fats and oils", and various glycerides? Is it overlap, inclusion in one direction or another, or synonymy?
I apologize for editing (2) without knowing the relationship. But the prior version was esters comprise most naturally occurring fats and oils, which are fatty acid esters of glycerol. This is confusing, perhaps even self-contradictory. Does it say "esters encompass most fatty acid esters of glycerol" or "esters account for most fatty acid esters of glycerol"? In any case, it seems to contain a definition and an empirical statement about prevalence wrapped up too closely together.
The word "comprise" can be problematic, unless the direction of inclusion is crystal-clear from context. The word is truly ambiguous as to what is a subset of what !! By Google:
(1) Consist of; be made up of. "The country comprises twenty states." Synonyms: consist of, be made up of, be composed of, contain, encompass, incorporate.
(2) Make up; constitute. "This single breed comprises 50 percent of the Swiss cattle population." "This breed comprises half the herd". Synonyms: make up, constitute, form, compose; account for.
Remarkably, neither reading seems to function correctly in the original version of (2). 89.217.9.188 ( talk) 02:44, 17 January 2015 (UTC)
Hello fellow Wikipedians,
I have just modified one external link on Ester. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
This message was posted before February 2018.
After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than
regular verification using the archive tool instructions below. Editors
have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
RfC before doing mass systematic removals. This message is updated dynamically through the template {{
source check}}
(last update: 5 June 2024).
Cheers.— InternetArchiveBot ( Report bug) 21:52, 23 September 2017 (UTC)
Please help with physical science am in grade 11 — Preceding unsigned comment added by 197.254.161.145 ( talk) 06:59, 6 September 2022 (UTC)