Happy to help with chemistry or other science articles. Relatively new to editing, so pointers are welcome.Anonrfjwhuikdzz (talk)02:44, 24 February 2025 (UTC)[reply]

WeCan't use Prod process, because it was previously atWP:AfD. Deprodding. Would you object to a basic redirect? What do you want merged? Please be exact and specific.Bearian (talk)09:21, 27 February 2025 (UTC)[reply]

Thanks for the note. I'm still re-learning how to edit/tag appropriately after a 16 year hiatus.

I think redirecting to aromatic compound makes more sense than a redirect to aryl. The fact thataryl andarene are derived from the same root ofaromatic can be noted there, though I haven't found a good source for this etymology.

This is what I would write (will repost to Ar- talk page too)

"The rootar- fromaromatic is shared by classes of molecules likearenes (all aromatic molecules) oraryls (aromatic funcional groups)."Anonrfjwhuikdzz (talk)02:33, 28 February 2025 (UTC)[reply]

I redirected this as an Alternative To Deletion (ATD).Bearian (talk)08:17, 3 March 2025 (UTC)[reply]

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Acid anhydride. No acyl variety.--Smokefoot (talk)19:13, 27 November 2025 (UTC)[reply]

@Smokefoot My understanding is that the NO2 group leftover after ripping off a hydroxy group from nitric acid is considered an acyl, so N2O5 is an inorganic acid anhydride. CO2 on the other hand lacks the R-O-R linkage that defines an acid anhydride. The acid anhydride of carbonic acid would be dicarbonic acid, though I believe that molecule is still only theoretical.Anonrfjwhuikdzz (talk)20:03, 27 November 2025 (UTC)[reply]

I dont think that many professional chemists would consider NO or NO⁺ to be an acyl, but I can see where you are coming from. Greenwood and Earnshaw's book also mentions the following anhydrides:F₂O, Cl₂O, Cl₂O₇, Br₂O₃.

One anhydride of carbonic acid would indeed be dicarbonic acid, the conjugate acid ofdicarbonate and one product of the hydrolysis ofdimethyl dicarbonate, which is well known. Another anhydride of carbonic acid is CO₂, the product of the degradation of the polymer [CO₂]_n. That theme has probably been well investigated computationally. But I digress, and I confess to being inexpert.

My main point is that "acid anhydride", which is kind of archaic terminology, is somewhat common outside of the confines of organic chemistry.--Smokefoot (talk)00:17, 28 November 2025 (UTC)[reply]

I agree most professional chemists would only consider organics when thinking about acyl groups, but I think that is more an educational bias in which the concept of an acyl group is only discussed as a part of OChem. All of the other anhydrides mentioned by Greenwood + Earnshaw meet the definition of an acid anhydride from what I've read (hypofluorous, hypochlorous, perchloric, and bromous acids for you examples, respectively). CO2 still does not meet the definition of an anhydride, though it is certainly a dehydrated form of carbonic acid.Anonrfjwhuikdzz (talk)03:28, 28 November 2025 (UTC)[reply]