Compounds in which a carbonyl group is bonded to two carbon atoms R2C=O
may be H
Compounds of structure such as R3SiC(=O)R are not ketones but acyl derivatives of substituted @S05663@.
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1346 (https://doi.org/10.1351/pac199567081307)