User talk:DMacks
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I want to include a synthetic reaction that is known as Clar's reaction. It is of a certain class of cyclic ketones that condense with themselves when heated to 400 C in a mixture of zinc dust and zinc chloride.
I will add references and a description of what it is used for in synthesizing new polycyclic aromatic hydrocarbons.
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MediaWiki message delivery 23:44, 23 January 2023 (UTC)
The page itself has 2 different length of carbon... https://upload.wikimedia.org/wikipedia/commons/thumb/6/64/3-methylornithine.svg/330px-3-methylornithine.svg.png
https://upload.wikimedia.org/wikipedia/commons/thumb/7/71/Pyrrolysine.svg/330px-Pyrrolysine.svg.png
I'm pretty confused... I don't know what to change ^^
Sciencationelle (talk) 16:52, 26 January 2023 (UTC)
- @Sciencationelle The article is correct but could do with expansion. If you click on its reference doi:10.1002/anie.201301164, you'll see a diagram that shows how 3-methyl ornithine first forms a dipeptide with lysine and then an enzyme cyclises the ornithine portion to form the ring. Mike Turnbull (talk) 11:39, 30 January 2023 (UTC)
- Take a look at File:Pyrrolysine Synthesis (corrected).png. In your first step, you take lysine and label the reaction "methylation". If a new carbon becomes attached as you say, it would give methyllysine not methylornithine. Compare your second structure with File:3-methylornithine.svg. The reaction instead is an isomerization: instead of a new carbon added, the chain gets shortened by one to supply the methyl group. Then notice in your last step (the multiple-arrows) how to have to lose one of the black carbons in the chain. If your black-and-red structure were to be correct, wouldn't the final product have a six-membered ring rather than five? Look at how many carbons there are between the methyl group and the nitrogen. Mike Turnbull's DOI link is a good one. DMacks (talk) 03:18, 31 January 2023 (UTC)
Thank you for just blanking that request. My gut said something was wrong with it, but I couldn't readily confirm it. —C.Fred (talk) 18:57, 29 January 2023 (UTC)
- @C.Fred: You're welcome! Google-translate of the Arabic helps for these sorts of things. DMacks (talk) 19:13, 29 January 2023 (UTC)
Latest tech news from the Wikimedia technical community. Please tell other users about these changes. Not all changes will affect you. Translations are available.
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Wikis that use localized numbering schemes for references need to add new CSS. This will help to show citation numbers the same way in all reading and ing modes. If your wiki would prefer to do it yourselves, please see the 
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MediaWiki message delivery 00:03, 31 January 2023 (UTC)