IUPAC names alkanoyl halides by replacing the -oic acid ending with an equal number of carbons per -oil . In addition, the word acid is replaced by the corresponding halogen, named as salt.

alkanoyl halides nomenclature 1

[1] Methanoyl chloride

[2] Ethanoyl bromide

[3] Propanoyl iodide

The longest chain containing the functional group is taken as the main chain. Numbering is done by giving the lowest locant to the carbon of the halide.

2-alkanoyl halide nomenclature

[4] 3-Methylhex-3-enoyl chloride

[5] 4-Chloro-3-ethylpentanoyl bromide

This functional group has priority over amines, alcohols, aldehydes, ketones, nitriles and amides (which must be named as substituents). Only carboxylic acids, anhydrides and esters have priority over it.

alkanoyl halides nomenclature 3

[6] 4-Hydroxy-3-methylpentanoyl chloride

[7] Bromide. 2-bromo-5-oxoheptanoyl

When in the molecule there is a priority group to the halide (carboxylic acid, anhydride, ester), the halide is named as: halocarbonyl.......

alkanoyl halides nomenclature 4

[8] 5-Chlorocarbonylhexanoic acid

[9] 4-Bromocarbonylbutanoic acid

When the halide is attached to a ring, the cycle is taken as the main chain and ends in

-carbonyl .

alkanoyl halides nomenclature 5

[10] Cyclohexanecarbonyl chloride

[11] 3-Methylcyclopentanecarbonyl bromide