What is "haloketone"

A haloketone in organic chemistry is a functional group consisting of a ketone group or more general a carbonyl group with a α- halogen substituent. The general structure is RR'C(X)C(=O)R where R is an alkyl or aryl residue and X any one of the halogens. The preferred conformation of a haloketone is that of a cisoid with the halogen and carbonyl sharing the same plane as the steric hindrance with the carbonyl alkyl group is generally larger.