Naming Aldehydes and Ketones If R-C=O is a substituent the name acyl(a-sil)group is used and name ending-yl is attached R H3C An acyl group Acetyl Formyl Benzoyl The prefix oxo-is used if ketone is not highest priority functional group and the carbonyl is considered a substituent on the parent chain See Appendix A and Table A.2 for naming polyfunctional organic compounds containing a ketone 00 CH3CH2CH2CCH2COCH3 Methyl 3-oxohexanoate 654-32-1 If R-C=O is a substituent the name acyl (a-sil) group is used and name ending –yl is attached The prefix oxo- is used if ketone is not highest priority functional group and the carbonyl is considered a substituent on the parent chain ▪ See Appendix A and Table A.2 for naming polyfunctional organic compounds containing a ketone Naming Aldehydes and Ketones