An acyl halide (also known as an acid halide) is a chemical compound derived from an oxoacid [1] by replacing a hydroxyl group (−OH) with a halide group (−X, where X is a halogen).

This page defines acyl halides and discusses their simple physical properties, introducing chemical reactivity in a general way.

An acyl halide is a functional group consisting of a carbonyl carbon bonded to a halogen atom, typically chlorine, bromine, or iodine. These compounds are highly reactive and are commonly …

The functional group of an acyl halide (acid halide) is an acyl group (RCO―) bonded to a halogen atom. They are named by changing the suffix -ic acid in the name of the parent carboxylic acid …

Acyl halides are reactive, hard electrophiles which can react with hard nucleophiles such as amines. They are generally obtained via the P450-catalyzed oxidative metabolism of geminal …

The acyl halide suffix is appended after the hydrocarbon suffix minus the "e" : e.g. -ane + -oyl halide = -anoyl halide etc. The most common halide encountered is the chloride, hence acyl or …

Acyl chlorides are the most commonly used acyl halides. The hydroxyl group of a sulfonic acid may also be replaced by a halogen to produce the corresponding sulfonyl halide.