Persistent carbene was one of the Natural sciences good articles, but it has been removed from the list. There are suggestions below for improving the article to meet the good article criteria. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake. | |||||||||||||
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Current status: Delisted good article |
This article is rated B-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||
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Hello,
I've recently updated this page with a few new sub-sections:
I was wondering if we need to have a bit of a reorganise of the sections.
1) Have a general remark as to what a persistent carbene is
2) History of stable carbenes
3) Classes of stable carbenes
4) General methods of preparing stable carbenes
5) Chemistry of stable carbenes
Also could:
Finally, I was wondering about how people find this page. A likely search word would be "stable carbene", "NHC", "carbene ligands" etc. How do we get diverts to this page?
I'm a bit new to all this and I don't want to trample on anyones toes, so please let me know what you think!!!
I think I've figured out how to do the auto-references now, so at some point I'll try and tidy these up.
all the best
Quantockgoblin
08:46, 15 August 2006 (UTC)
Thanks - if anyone else is happy with the above changes then I suggest we go with it
Quantockgoblin
13:45, 15 August 2006 (UTC)
It would be nice to have a bit of colour on this page, even if it is of a white solid in a schlenk tube! If people are still in the habit of subliming these carbenes, perhaps they could take a photo and upload it to this page?
A nice way to sublime these carbenes (when free from metals) is to place a tight fitting rubber filtration cone (the sort used for getting a good seal when using a Buchner funnel) half way up the outside of a schlenk tube and fill it with dry-ice acetone and gently heat the solid in the bottom of the schlenk tube with warm water whilst applying a vacuum. The carbene sublimes as a nice white band, perfect for a photo. I would do it but I'm no longer in the lab. Obviously just wash out the residue from the bottom of the tube and wha-la, isolated carbene.
Quantockgoblin 09:25, 15 August 2006 (UTC)
I work in Arduengo group - could get a photo of one assuming it's alright with him. —Preceding unsigned comment added by 97.67.109.101 ( talk) 19:22, 17 October 2009 (UTC)
In a foreword for a special issue of Australian Journal of Chemistry a couple of years ago ( here, scroll down a bit to the abstract for page 1106), Arduengo provided a picture of the original sample of the diadamantylimidazo-2-ylidene. The picture is posted on the AJC website and the Foreword is available for download without charge. Could that picture be used here? There appears to be no copyright restriction that I can see and it sure would be nice to have a picture of the originally prepared carbene. There is a designation or compound number on the vial (a DuPont notebook number???). -- 166.205.55.41 ( talk) 14:47, 4 January 2013 (UTC)
I wanted to generate a table of elements that co-ordinate to carbenes.
To do this I've used the code found on the page for Periodic table (standard) (I hope that is alright) and edited it a bit so that it can be used updated with elements that co-ordinate to stable carbenes.
There a few problems, since I used the code from table of elements it has template colours which are:
The problem is that the code is a bit misleading but will read fine when it is on the web!
your views / comments please!
Quantockgoblin 12:50, 22 August 2006 (UTC)
I'm not sure how you put a internal link into a wiki article, e.g. Wanzlick equilibrium has a wiki link near the start of this article, but is more or less covered later in the article, so it would be great to have a jump-to that section. Quantockgoblin 15:08, 22 October 2006 (UTC)
This page had a link to the disambiguation page equilibrium. I disambiguated it to chemical equilibrium but am not sure whether that was the best choice. Feel free to modify it to point to what you feel is a more appropriate page. -- Coppertwig 01:40, 5 February 2007 (UTC)
This almost passes. It needs a infobox at the top though. Contact me when finished and i will review it then.
Geoff Plourde (
talk)
21:57, 20 February 2008 (UTC)
First, I am going to strike my prior statement as there is is no clear need for a infobox. I am reviewing this article for GA status in accordance with the current criteria. I have not contributed to this article and had never heard of the topic prior to today. I do not know the principal authors of this article.
As regards GAC 1, I find this article to be extremely well written. One area where it needs to improve is in the style. As it stands this article could difficult to understand by people with minimal chemical kwnowledge.
As regards GAC 2, sources are available. I am pleased by the large number of sources. (Reference section nearly crashed my browser). i see no room for improvement.
It is broad in its coverage (GAC 3), neutral(4), and stable (5). Images are provided in sufficient quantity.
As such this in my opinion is a good article. Geoff Plourde ( talk) 00:46, 21 February 2008 (UTC)
Just a point on presentation.
Is there any reason why some images are in frames and others are not? I think the article would look better if all the diagrams had the same format, in terms of frames and sizes. Also I've tried to remove some "white space" from the article as I think that looks bad too.
Also, ideally the images should be redrawn as SVG images. Quantockgoblin ( talk) 11:41, 20 March 2008 (UTC)
This article is too technical and detailed; it seems written by a specialist for other specialists. Please remember that WP is an encyclopedia, not a chemical textbook. In style and language, it should be more like Scientific American than the Journal of the ACS. Methinks that much of the detail (e.g. short-lived mistaken theories, the chemical experiments that were used to prove or disprove technical conjectures, etc.) should be trimmed or moved to separate, more specialized articles.
Also, there seems to be to much emphasis on who precisely conjectured what and which group proved which other group's claims were wrong. It reads like there is sort of an ego war going on between those groups, is that so?
All the best, --
Jorge Stolfi (
talk)
14:43, 3 December 2009 (UTC)
This content was recently deleted.
Carbenes that formally derive from imidazole-2-ylidenes by substitution of sulfur, oxygen, or other chalcogens for both α-nitrogens are expected to be unstable, as they have the potential to dissociate into an alkyne (R1C≡CR2) and a carbon dichalcogenide (X1=C=X2). citation needed
Stated reason: "citation needed" since 2009. People add "citation needed" tags to text items all the time often for no good reason. I respect that fellow editors feel compelled to add these tags but I feel no obligation whatsoever to rush to a library and spent effort on providing a citation especially when a statement is not controversial or when it is plainly obvious (as in this case) that the citation is the one in the next paragraph (ref 40). I also expect that content such as this piece of content remains on the page until such time that a fellow editor does add a citation be it in 2014 or 2024 or 2035. Thanks V8rik ( talk) 18:23, 16 November 2014 (UTC)
"Carbenes that formally derive from imidazole-2-ylidenes by substitution of sulfur, oxygen, or other chalcogens for both α-nitrogens are expected to be unstable, as they have the potential to dissociate into an alkyne (R1C≡CR2) and a carbon dichalcogenide (X1=C=X2). citation needed"
NHCs are a big deal. They emerged from studies on persistent carbenes, which would be the history section of a revised article.-- Smokefoot ( talk) 00:41, 14 January 2020 (UTC)
The following discussion is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.
Because of an overload of chemistry articles at GAR, if delisting, do not close before 2 March.
Quite a lot of uncited material including
and many more. These will need to be cited. Onegreatjoke ( talk) 22:12, 9 February 2023 (UTC)
Persistent carbene was one of the Natural sciences good articles, but it has been removed from the list. There are suggestions below for improving the article to meet the good article criteria. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake. | |||||||||||||
| |||||||||||||
Current status: Delisted good article |
This article is rated B-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||
|
Hello,
I've recently updated this page with a few new sub-sections:
I was wondering if we need to have a bit of a reorganise of the sections.
1) Have a general remark as to what a persistent carbene is
2) History of stable carbenes
3) Classes of stable carbenes
4) General methods of preparing stable carbenes
5) Chemistry of stable carbenes
Also could:
Finally, I was wondering about how people find this page. A likely search word would be "stable carbene", "NHC", "carbene ligands" etc. How do we get diverts to this page?
I'm a bit new to all this and I don't want to trample on anyones toes, so please let me know what you think!!!
I think I've figured out how to do the auto-references now, so at some point I'll try and tidy these up.
all the best
Quantockgoblin
08:46, 15 August 2006 (UTC)
Thanks - if anyone else is happy with the above changes then I suggest we go with it
Quantockgoblin
13:45, 15 August 2006 (UTC)
It would be nice to have a bit of colour on this page, even if it is of a white solid in a schlenk tube! If people are still in the habit of subliming these carbenes, perhaps they could take a photo and upload it to this page?
A nice way to sublime these carbenes (when free from metals) is to place a tight fitting rubber filtration cone (the sort used for getting a good seal when using a Buchner funnel) half way up the outside of a schlenk tube and fill it with dry-ice acetone and gently heat the solid in the bottom of the schlenk tube with warm water whilst applying a vacuum. The carbene sublimes as a nice white band, perfect for a photo. I would do it but I'm no longer in the lab. Obviously just wash out the residue from the bottom of the tube and wha-la, isolated carbene.
Quantockgoblin 09:25, 15 August 2006 (UTC)
I work in Arduengo group - could get a photo of one assuming it's alright with him. —Preceding unsigned comment added by 97.67.109.101 ( talk) 19:22, 17 October 2009 (UTC)
In a foreword for a special issue of Australian Journal of Chemistry a couple of years ago ( here, scroll down a bit to the abstract for page 1106), Arduengo provided a picture of the original sample of the diadamantylimidazo-2-ylidene. The picture is posted on the AJC website and the Foreword is available for download without charge. Could that picture be used here? There appears to be no copyright restriction that I can see and it sure would be nice to have a picture of the originally prepared carbene. There is a designation or compound number on the vial (a DuPont notebook number???). -- 166.205.55.41 ( talk) 14:47, 4 January 2013 (UTC)
I wanted to generate a table of elements that co-ordinate to carbenes.
To do this I've used the code found on the page for Periodic table (standard) (I hope that is alright) and edited it a bit so that it can be used updated with elements that co-ordinate to stable carbenes.
There a few problems, since I used the code from table of elements it has template colours which are:
The problem is that the code is a bit misleading but will read fine when it is on the web!
your views / comments please!
Quantockgoblin 12:50, 22 August 2006 (UTC)
I'm not sure how you put a internal link into a wiki article, e.g. Wanzlick equilibrium has a wiki link near the start of this article, but is more or less covered later in the article, so it would be great to have a jump-to that section. Quantockgoblin 15:08, 22 October 2006 (UTC)
This page had a link to the disambiguation page equilibrium. I disambiguated it to chemical equilibrium but am not sure whether that was the best choice. Feel free to modify it to point to what you feel is a more appropriate page. -- Coppertwig 01:40, 5 February 2007 (UTC)
This almost passes. It needs a infobox at the top though. Contact me when finished and i will review it then.
Geoff Plourde (
talk)
21:57, 20 February 2008 (UTC)
First, I am going to strike my prior statement as there is is no clear need for a infobox. I am reviewing this article for GA status in accordance with the current criteria. I have not contributed to this article and had never heard of the topic prior to today. I do not know the principal authors of this article.
As regards GAC 1, I find this article to be extremely well written. One area where it needs to improve is in the style. As it stands this article could difficult to understand by people with minimal chemical kwnowledge.
As regards GAC 2, sources are available. I am pleased by the large number of sources. (Reference section nearly crashed my browser). i see no room for improvement.
It is broad in its coverage (GAC 3), neutral(4), and stable (5). Images are provided in sufficient quantity.
As such this in my opinion is a good article. Geoff Plourde ( talk) 00:46, 21 February 2008 (UTC)
Just a point on presentation.
Is there any reason why some images are in frames and others are not? I think the article would look better if all the diagrams had the same format, in terms of frames and sizes. Also I've tried to remove some "white space" from the article as I think that looks bad too.
Also, ideally the images should be redrawn as SVG images. Quantockgoblin ( talk) 11:41, 20 March 2008 (UTC)
This article is too technical and detailed; it seems written by a specialist for other specialists. Please remember that WP is an encyclopedia, not a chemical textbook. In style and language, it should be more like Scientific American than the Journal of the ACS. Methinks that much of the detail (e.g. short-lived mistaken theories, the chemical experiments that were used to prove or disprove technical conjectures, etc.) should be trimmed or moved to separate, more specialized articles.
Also, there seems to be to much emphasis on who precisely conjectured what and which group proved which other group's claims were wrong. It reads like there is sort of an ego war going on between those groups, is that so?
All the best, --
Jorge Stolfi (
talk)
14:43, 3 December 2009 (UTC)
This content was recently deleted.
Carbenes that formally derive from imidazole-2-ylidenes by substitution of sulfur, oxygen, or other chalcogens for both α-nitrogens are expected to be unstable, as they have the potential to dissociate into an alkyne (R1C≡CR2) and a carbon dichalcogenide (X1=C=X2). citation needed
Stated reason: "citation needed" since 2009. People add "citation needed" tags to text items all the time often for no good reason. I respect that fellow editors feel compelled to add these tags but I feel no obligation whatsoever to rush to a library and spent effort on providing a citation especially when a statement is not controversial or when it is plainly obvious (as in this case) that the citation is the one in the next paragraph (ref 40). I also expect that content such as this piece of content remains on the page until such time that a fellow editor does add a citation be it in 2014 or 2024 or 2035. Thanks V8rik ( talk) 18:23, 16 November 2014 (UTC)
"Carbenes that formally derive from imidazole-2-ylidenes by substitution of sulfur, oxygen, or other chalcogens for both α-nitrogens are expected to be unstable, as they have the potential to dissociate into an alkyne (R1C≡CR2) and a carbon dichalcogenide (X1=C=X2). citation needed"
NHCs are a big deal. They emerged from studies on persistent carbenes, which would be the history section of a revised article.-- Smokefoot ( talk) 00:41, 14 January 2020 (UTC)
The following discussion is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.
Because of an overload of chemistry articles at GAR, if delisting, do not close before 2 March.
Quite a lot of uncited material including
and many more. These will need to be cited. Onegreatjoke ( talk) 22:12, 9 February 2023 (UTC)