> as lemmas

1871 H. E. Roscoe Lessons Elem. Chem. (new ed.) xxxv. 381 Carbonyl Chloride..is formed when dry carbonyl and dry chlorine gases are brought together in sunlight.

1905 Jrnl. Chem. Soc. 87 185 Reactions involving the addition of metallic hydrogen sulphites [etc.]..to carbonyl groups.

1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) xlv. 671 Unsaturated carbonyl derivatives, e.g. acids, aldehydes, and ketones, also combine with oxygen, yielding ozonides.

1931 Proc. Royal Soc. A. 132 253 Some of the substances we propose to investigate are known to undergo photochemical decomposition, in particular carbonyl sulphide.

1938 C. F. H. Allen & A. H. Blatt in H. Gilman Org. Chem. I. vi. 569 Oximes, hydrazones, and phenylhydrazones are utilized primarily for isolating and identifying carbonyl compounds.

1950 Science 22 Dec. 756/2 A carbonyl group in place of a carboxyl group, as in the peptides, may be sufficient for adjuvant action.

1981 P. Sykes Guidebk. to Mechanism in Org. Chem. (ed. 5) viii. 222 Crossed aldol condensations, where both aldehydes (or other suitable carbonyl compounds) have α-H atoms, are not normally of any preparative value.

1991 Mech. Engin. Sept. 48/2 Burning a mixture of coal, water, and oxygen to produce a synthesis gas made of hydrogen sulfide and carbonyl sulfide.

2001 New Scientist 2 June 19/1 An unusual oxopolysaccharide—a sugar with reactive carbonyl groups attached—is responsible.