The chemistry of enones, 1989: CIP galley (unsaturated carbonyl compounds; an enone molecule [is] made up of several fragments, two of which are the vinyl moiety (C=C) and carbonyl moiety (C=Ö)) http://id.loc.gov/authorities/subjects/sh85020143 lcsh http://data.bnf.fr/ark:/12148/cb12272459g rameau http://lemac.sgcb.mcu.es/Autoridades/LEMAC201205253/concept lemac

Britannica online, July 2, 2020 (Carbonyl group, in organic chemistry, a divalent chemical unit consisting of a carbon (C) and an oxygen (O) atom connected by a double bond. The group is a constituent of carboxylic acids, esters, anhydrides, acyl halides, amides, and quinones, and it is the characteristic functional group (reactive group) of aldehydes and ketones. Carboxylic acids (and their derivatives), aldehydes, ketones, and quinones are also known collectively as carbonyl compounds)

Carbonyl compound - an overview, via ScienceDirect, July 2, 2020 (Carbonyl compounds are molecules containing the carbonyl group, C=O)

The carbonyl group, via Chemistry LibreTexts website, July 2, 2020 (A carbonyl group is a chemically organic functional group composed of a carbon atom double-bonded to an oxygen atom --> [C=O] The simplest carbonyl groups are aldehydes and ketones usually attached to another carbon compound; the C=O entity itself is known as the "Carbonyl group" while the members of this group are called "carbonyl compounds" --> X-C=O)