in respect to the article on fluor-bi-profen, structural formula, [ http://en.wikipedia.org/?title=File_talk:(%C2%B1)-Flurbiprofen_Structural_Formulae_V.1.svg], please be kind and edit image to display only one molecule, because most users cannot read your picture as displaying two complex molecula. Math cat`ing ( talk) 12:22, 4 April 2011 (UTC)
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Hello Jü, do you know whether chlorprothixene is really cis- only? Best, Fvasconcellos ( t· c) 18:04, 26 August 2009 (UTC)
Putting an image that shows both isomers is redundant and unaesthetic. A simple (RS)- or (±)- prefix in the chemical name field will do just fine. If there's something wrong with the current image, go ahead and replace it if you wish, but do not replace it with one that has two structures in it please. El3ctr0nika ( talk) 20:03, 10 September 2009 (UTC)
This whole thing is just a stupid technical discrepancy that you need to get over. An image containing both enantiomers is not necessary and unaesthetic for the page. The vast majority of drugs are produced as racemates. Having a single isomer is rare and usually only done in special circumstances such as to get rid of certain pharmacological effects like in the case of d-amphetamine or escitalopram. Besides, on all the major chemical websites like PubChem, Chemspider, DrugBank, etc, only one enantiomer is shown. Ok? My friend Nuklear disapproves of your doings as well. El3ctr0nika ( talk) 20:18, 12 September 2009 (UTC)
Moi, moi,
When I compare these isomers with
those, they differ. The piperidines are turned over. I cannot imagine this is due to the HCL. Moreover the threo positions seem correct in the pdf (positions of phenyl and piperidine, right?).
Can you have a look at it?--
Wickey-nl (
talk)
15:00, 27 October 2009 (UTC)
Moin, moin, Jü, Still a few questions about the medicine
methylphenidate.
1. Do you agree with naming
this molecule as R,S-(+)-erythro-methylphenidate and certainly not Ritalin?
2. Is it possible at all, to make one of the four isomers (R,R) 100 % pure? Or does the drug always have, to a certain extent, the remainder of three isomers plus these of the used chemicals and intermediate products?--
Wickey-nl (
talk)
17:20, 19 November 2009 (UTC)
Hello Jü, an editor has asked at Talk:Amlodipine for more information on stereochemistry to be included in the article. Perhaps you can help? Best wishes, Fvasconcellos ( t· c) 21:14, 10 December 2009 (UTC)
Although well intentioned, your image of the Lindlar catalyst is very misleading. It is not a series of compounds anymore than sodium chloride is a series of percursors. The material is quite complicated for sure, but it is probably an alloy or intermetallic with surface-bound quinoline ligands. I realize that even excellent chemists sometimes seek to present idealized views of complicated stuff, but sometimes such views are more misleading than they are helpful. Cheers,-- Smokefoot ( talk) 17:38, 1 January 2010 (UTC)
Regarding your edit to rivaroxaban: In which sense has the new formula (PNG) a higher resolution than the old one (SVG)? I always thought that vector images were preferred over raster images? Just curious. -- ἀνυπόδητος ( talk) 14:34, 31 January 2010 (UTC)
Good idea to add this box of historical benzene formulas. But since you placed this box in the middle of the section on the ring formula of Kekule, don't you think you should add Kekule's formula to the box? Ajrocke ( talk) 12:09, 20 July 2010 (UTC)
About your nice drawing of a vulcanized polyisoprene: My impression was that there are no vinyl-S bonds, it all allylic with possibly some products of SH addition across C=C. Also your inclusion of the C2S4 ring also surprised me as the parent rings usually are not very long lived, tending to ring-open. The high S content usually is attributed to tri- and tetrasulfides beteen chains. Of course a complicating factor is that such materials are heterogeneous. But vulcanizates do obey the rules of organosulfur chemistry - vinylpolysulfides and tetrathiacyclohexanes are unhappy or at least rare. Also vulcanization is conducted at rather hot temperatures and in the presence of nucleophiles that tend to equilibrate unstable structure. So I am interested in your views on this matter. Best wishes, -- Smokefoot ( talk) 16:40, 17 July 2011 (UTC)
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Hi Jü. First, I would like to say that I like your chemical structure images. It is good to have your improvements from lower quality .gif and .png images to your higher quality .svg images. However, I have noticed in many cases that you replace existing high quality .svg images with yours. I presume that you are doing this because you prefer the style where skeletal formulas terminate with CH3 rather than just the end of a line. This is a matter of style that seems to differ on the English Wikipedia compared to the German Wikipedia, your home wiki. Based on comparison to policies such as WP:ENGVAR or WP:BCE, which essentially forbid changing from one style to another person's preferred style without consensus, when the quality of the image is not an improvement, it is a bad idea to change images solely on matters of style. So I would like to ask you to stop doing this unless there is consensus to do so at WT:CHEM or WT:CHEM. (And, likewise, if I went to the German Wikipedia and started replacing images like File:Pentylamine Structural Formula V.1.svg with images like File:Pentylamine.svg, I would expect to be asked to stop.) Thank you. ChemNerd ( talk) 15:53, 26 July 2013 (UTC)
Hi Jü, we have met a couple of times before on the Dutch version of Wikipedia and I know you are quite acquainted with organic chemistry. I contact you in order to get something clarified. I am currently reading the book 'Classics in Total Synthesis' (1996) by Nicolaou and Sorensen in order to gain some background information that could be used on Wikipedia (and also to train myself in comprehending total synthesis strategies). I came across the total synthesis of monensin by Kishi, published in JACS in 1979: it is a very convergent one, that uses a particular interesting late-stage aldol reaction, namely:
The left wing of the molecule possesses two potential electrophilic sites: an aldehyde (indicated in blue) and an ester (indicated in green). What fascinates me (and also the authors of the book) is the fact that the aldehyde chemoselectively reacts with the methyl ketone enolate. The ester functionality remains untouched. Then, I was thinking a bit further, and wondered whether this also could happen when the aldehyde was a ketone, and thus: to what extend the competition between aldol reaction and Claisen reaction applies. Furthermore, if this would be an intramolecular process, the Baldwin rules have to be applied. To give a more simple example:
I would expect that there will be some competition on this substrate: both the ester and the ketone are electrophilic. Another contributing factor here could be the ring size (according to Baldwin rules, enolendo-exo-trig cyclization is disfavored for 3-5 membered rings, which would imply that the Claisen condensation is more important and the seven membered ring is formed; but on the other hand: entropy discourages the formation of larger rings). I have searched some literature via SciFinder, because I would like to expand the articles on Wikipedia concerning aldol and Claisen competition, and found one paper where it was the other way around: the aldol reaction (and subsequent condensation to the five-membered enone) occurs, while the ester remains untouched (in the example above, the ester is even more hindered by the adjacent quaternary center and perhaps this could further drive the reaction towards the aldol reaction). Could you somehow explain the outcome of such events and help me to understand this phenomenon? Best regards, Capaccio ( talk) 16:08, 4 January 2014 (UTC)
I love this structure of yours, [1], but I would like to know which software you used, the reason being is that I would like to create a structure that's similar for my own Wiki (from Wikia). Vielen Dank für Ihre Zeit (I hope that means in German, "Thank you for time"). Brenton ( contribs · email · talk · uploads) 06:22, 12 September 2014 (UTC)
The following Talk entry, [4], thank you. Le Prof Leprof 7272 ( talk) 21:43, 16 July 2015 (UTC)
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SwisterTwister talk 18:18, 28 July 2017 (UTC)The article Deutsche Extrakt Kaffee has been proposed for deletion because of the following concern:
Fails WP:NCORP. All I can find are Bloomberg-esque entries which confer no notability.
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Hello Jü, first of all, I really appreciate your work here at Wikipedia, I like your uploaded images especially. The reason I'm writing this post is that I stumbled upon one of those images, namely on the page of oct-1-en-3-ol [ [5]] and I compared it to other sources. Are you sure that's the correct structure of oct-1-en-3-ol? I just checked nist.gov, and their page shows an image without the dashed wedge hydrogen atom (link). Then I checked CRC Handbook of Chemistry and Physics (98th Edition) and found the same image there, without the wedged H. After that I drew the structure of oct-1-en-3-ol without the wedged H in a PC program called "ACD/Chemsketch" and used the "Generate name" function. It showed the following result: "oct-1-en-3-ol". Then I went and drew the structure, but this time with the wedged hydrogen atom, just like in your image. Again called the Generate Name function, and the result was: "(3R)-oct-1-en-3-ol". So, is it possible that the current image at oct-1-en-3-ol page [ [6]] shows one of the two enantiomers instead of generic oct-1-en-3-ol? If so, wouldn't it be better to show both enantiomers instead of just one?
Excuse me if I misunderstood something here, I'm new at chemistry, so I might be wrong. Assaiki ( talk) 19:17, 19 January 2018 (UTC)
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Note that any non-free images not used in any articles will be deleted after seven days, as described in section F5 of the criteria for speedy deletion. Thank you. -- B-bot ( talk) 16:05, 8 June 2022 (UTC)
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Thanks for the addition of doi:10.1016/j.chroma.2009.12.071 to thin-layer chromatography. Definitely a useful low-intensity alternative to chiral HPLC for qualitative work. Do you think this should be more centrally placed, such as in chiral column chromatography (a tiny stub at the moment), with that article renamed to chiral chromatography? Already that article includes chiral GC, whereas column chromatography appears to restrict the term column chromatography to liquid mobile phases. DMacks ( talk) 15:31, 24 October 2022 (UTC)
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in respect to the article on fluor-bi-profen, structural formula, [ http://en.wikipedia.org/?title=File_talk:(%C2%B1)-Flurbiprofen_Structural_Formulae_V.1.svg], please be kind and edit image to display only one molecule, because most users cannot read your picture as displaying two complex molecula. Math cat`ing ( talk) 12:22, 4 April 2011 (UTC)
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Hello Jü, do you know whether chlorprothixene is really cis- only? Best, Fvasconcellos ( t· c) 18:04, 26 August 2009 (UTC)
Putting an image that shows both isomers is redundant and unaesthetic. A simple (RS)- or (±)- prefix in the chemical name field will do just fine. If there's something wrong with the current image, go ahead and replace it if you wish, but do not replace it with one that has two structures in it please. El3ctr0nika ( talk) 20:03, 10 September 2009 (UTC)
This whole thing is just a stupid technical discrepancy that you need to get over. An image containing both enantiomers is not necessary and unaesthetic for the page. The vast majority of drugs are produced as racemates. Having a single isomer is rare and usually only done in special circumstances such as to get rid of certain pharmacological effects like in the case of d-amphetamine or escitalopram. Besides, on all the major chemical websites like PubChem, Chemspider, DrugBank, etc, only one enantiomer is shown. Ok? My friend Nuklear disapproves of your doings as well. El3ctr0nika ( talk) 20:18, 12 September 2009 (UTC)
Moi, moi,
When I compare these isomers with
those, they differ. The piperidines are turned over. I cannot imagine this is due to the HCL. Moreover the threo positions seem correct in the pdf (positions of phenyl and piperidine, right?).
Can you have a look at it?--
Wickey-nl (
talk)
15:00, 27 October 2009 (UTC)
Moin, moin, Jü, Still a few questions about the medicine
methylphenidate.
1. Do you agree with naming
this molecule as R,S-(+)-erythro-methylphenidate and certainly not Ritalin?
2. Is it possible at all, to make one of the four isomers (R,R) 100 % pure? Or does the drug always have, to a certain extent, the remainder of three isomers plus these of the used chemicals and intermediate products?--
Wickey-nl (
talk)
17:20, 19 November 2009 (UTC)
Hello Jü, an editor has asked at Talk:Amlodipine for more information on stereochemistry to be included in the article. Perhaps you can help? Best wishes, Fvasconcellos ( t· c) 21:14, 10 December 2009 (UTC)
Although well intentioned, your image of the Lindlar catalyst is very misleading. It is not a series of compounds anymore than sodium chloride is a series of percursors. The material is quite complicated for sure, but it is probably an alloy or intermetallic with surface-bound quinoline ligands. I realize that even excellent chemists sometimes seek to present idealized views of complicated stuff, but sometimes such views are more misleading than they are helpful. Cheers,-- Smokefoot ( talk) 17:38, 1 January 2010 (UTC)
Regarding your edit to rivaroxaban: In which sense has the new formula (PNG) a higher resolution than the old one (SVG)? I always thought that vector images were preferred over raster images? Just curious. -- ἀνυπόδητος ( talk) 14:34, 31 January 2010 (UTC)
Good idea to add this box of historical benzene formulas. But since you placed this box in the middle of the section on the ring formula of Kekule, don't you think you should add Kekule's formula to the box? Ajrocke ( talk) 12:09, 20 July 2010 (UTC)
About your nice drawing of a vulcanized polyisoprene: My impression was that there are no vinyl-S bonds, it all allylic with possibly some products of SH addition across C=C. Also your inclusion of the C2S4 ring also surprised me as the parent rings usually are not very long lived, tending to ring-open. The high S content usually is attributed to tri- and tetrasulfides beteen chains. Of course a complicating factor is that such materials are heterogeneous. But vulcanizates do obey the rules of organosulfur chemistry - vinylpolysulfides and tetrathiacyclohexanes are unhappy or at least rare. Also vulcanization is conducted at rather hot temperatures and in the presence of nucleophiles that tend to equilibrate unstable structure. So I am interested in your views on this matter. Best wishes, -- Smokefoot ( talk) 16:40, 17 July 2011 (UTC)
Thanks for uploading File:DQS UL Logo.svg. The image description page currently specifies that the image is non-free and may only be used on Wikipedia under a claim of fair use. However, the image is currently not used in any articles on Wikipedia. If the image was previously in an article, please go to the article and see why it was removed. You may add it back if you think that that will be useful. However, please note that images for which a replacement could be created are not acceptable for use on Wikipedia (see our policy for non-free media).
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noq (
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18:18, 23 September 2012 (UTC)
Hi Jü. First, I would like to say that I like your chemical structure images. It is good to have your improvements from lower quality .gif and .png images to your higher quality .svg images. However, I have noticed in many cases that you replace existing high quality .svg images with yours. I presume that you are doing this because you prefer the style where skeletal formulas terminate with CH3 rather than just the end of a line. This is a matter of style that seems to differ on the English Wikipedia compared to the German Wikipedia, your home wiki. Based on comparison to policies such as WP:ENGVAR or WP:BCE, which essentially forbid changing from one style to another person's preferred style without consensus, when the quality of the image is not an improvement, it is a bad idea to change images solely on matters of style. So I would like to ask you to stop doing this unless there is consensus to do so at WT:CHEM or WT:CHEM. (And, likewise, if I went to the German Wikipedia and started replacing images like File:Pentylamine Structural Formula V.1.svg with images like File:Pentylamine.svg, I would expect to be asked to stop.) Thank you. ChemNerd ( talk) 15:53, 26 July 2013 (UTC)
Hi Jü, we have met a couple of times before on the Dutch version of Wikipedia and I know you are quite acquainted with organic chemistry. I contact you in order to get something clarified. I am currently reading the book 'Classics in Total Synthesis' (1996) by Nicolaou and Sorensen in order to gain some background information that could be used on Wikipedia (and also to train myself in comprehending total synthesis strategies). I came across the total synthesis of monensin by Kishi, published in JACS in 1979: it is a very convergent one, that uses a particular interesting late-stage aldol reaction, namely:
The left wing of the molecule possesses two potential electrophilic sites: an aldehyde (indicated in blue) and an ester (indicated in green). What fascinates me (and also the authors of the book) is the fact that the aldehyde chemoselectively reacts with the methyl ketone enolate. The ester functionality remains untouched. Then, I was thinking a bit further, and wondered whether this also could happen when the aldehyde was a ketone, and thus: to what extend the competition between aldol reaction and Claisen reaction applies. Furthermore, if this would be an intramolecular process, the Baldwin rules have to be applied. To give a more simple example:
I would expect that there will be some competition on this substrate: both the ester and the ketone are electrophilic. Another contributing factor here could be the ring size (according to Baldwin rules, enolendo-exo-trig cyclization is disfavored for 3-5 membered rings, which would imply that the Claisen condensation is more important and the seven membered ring is formed; but on the other hand: entropy discourages the formation of larger rings). I have searched some literature via SciFinder, because I would like to expand the articles on Wikipedia concerning aldol and Claisen competition, and found one paper where it was the other way around: the aldol reaction (and subsequent condensation to the five-membered enone) occurs, while the ester remains untouched (in the example above, the ester is even more hindered by the adjacent quaternary center and perhaps this could further drive the reaction towards the aldol reaction). Could you somehow explain the outcome of such events and help me to understand this phenomenon? Best regards, Capaccio ( talk) 16:08, 4 January 2014 (UTC)
I love this structure of yours, [1], but I would like to know which software you used, the reason being is that I would like to create a structure that's similar for my own Wiki (from Wikia). Vielen Dank für Ihre Zeit (I hope that means in German, "Thank you for time"). Brenton ( contribs · email · talk · uploads) 06:22, 12 September 2014 (UTC)
The following Talk entry, [4], thank you. Le Prof Leprof 7272 ( talk) 21:43, 16 July 2015 (UTC)
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I removed the CSD G10 tag because it didn't appear to be an attack page, as Wikipedia understands it. But as an account identifying itself as the subject of the article has asked for its deletion, it warrants further discussion. I hope you can contribute to the deletion discussion. Liz Read! Talk! 16:07, 6 October 2015 (UTC)
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SwisterTwister talk 18:18, 28 July 2017 (UTC)The article Deutsche Extrakt Kaffee has been proposed for deletion because of the following concern:
Fails WP:NCORP. All I can find are Bloomberg-esque entries which confer no notability.
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Hello Jü, first of all, I really appreciate your work here at Wikipedia, I like your uploaded images especially. The reason I'm writing this post is that I stumbled upon one of those images, namely on the page of oct-1-en-3-ol [ [5]] and I compared it to other sources. Are you sure that's the correct structure of oct-1-en-3-ol? I just checked nist.gov, and their page shows an image without the dashed wedge hydrogen atom (link). Then I checked CRC Handbook of Chemistry and Physics (98th Edition) and found the same image there, without the wedged H. After that I drew the structure of oct-1-en-3-ol without the wedged H in a PC program called "ACD/Chemsketch" and used the "Generate name" function. It showed the following result: "oct-1-en-3-ol". Then I went and drew the structure, but this time with the wedged hydrogen atom, just like in your image. Again called the Generate Name function, and the result was: "(3R)-oct-1-en-3-ol". So, is it possible that the current image at oct-1-en-3-ol page [ [6]] shows one of the two enantiomers instead of generic oct-1-en-3-ol? If so, wouldn't it be better to show both enantiomers instead of just one?
Excuse me if I misunderstood something here, I'm new at chemistry, so I might be wrong. Assaiki ( talk) 19:17, 19 January 2018 (UTC)
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Note that any non-free images not used in any articles will be deleted after seven days, as described in section F5 of the criteria for speedy deletion. Thank you. -- B-bot ( talk) 16:05, 8 June 2022 (UTC)
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✠ SunDawn ✠ (contact) 12:19, 23 October 2022 (UTC)
Thanks for the addition of doi:10.1016/j.chroma.2009.12.071 to thin-layer chromatography. Definitely a useful low-intensity alternative to chiral HPLC for qualitative work. Do you think this should be more centrally placed, such as in chiral column chromatography (a tiny stub at the moment), with that article renamed to chiral chromatography? Already that article includes chiral GC, whereas column chromatography appears to restrict the term column chromatography to liquid mobile phases. DMacks ( talk) 15:31, 24 October 2022 (UTC)
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