Definition of acyl groups

Groups formed by removing one or more hydroxy groups from oxoacids that have the general structure RkE(=O)l(OH)m (l not equal to 0), and replacement analogues of such acyl groups. NOC Rules C-403, C-543.3, C-631.1, C-641.7, C-641.8, C-641.9, D-5.67, RNRI Rule RC-81.2.2. E.g. CH 3C(=O)-, CH3C(=NR)-, CH3C(=S)-, PhS(=O)2-, HP(N)-, . In organic chemistry an unspecified acyl group is commonly a carboxylic acyl group