Compounds consisting of an acyl group bonded to halogen, e.g. $\ce{CH3S(=O)2Cl}$, methanesulfonyl chloride; $\ce{CH3COCl}$, acetyl chloride; cyclohexanecarboximidoyl chloride,
Source: PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1311 [Terms] [Paper]
