Pentanoyl chloride

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Pentanoyl chloride
Pentanoyl chloride.svg
Preferred IUPAC name
Pentanoyl chloride
Other names
Valeroyl chloride; n-Pentanoyl chloride
3D model (JSmol)
ECHA InfoCard 100.010.301 Edit this at Wikidata
  • CCCCC(=O)Cl
Molar mass 120.58 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Pentanoyl chloride is an acyl chloride derived from pentanoic acid. It is a colorless liquid that is used to attach the valeroyl group. It is usually produced by chlorination of valeric acid.[1]


Like related acyl chlorides, valeryl chloride hydrolyzes readily:

CH3(CH2)3C(O)Cl + H2O → CH3(CH2)3CO2H + HCl

Alcohols react to give esters:

CH3(CH2)3C(O)Cl + ROH → CH3(CH2)3CO2R + HCl

Amines react to give amides:

CH3(CH2)3C(O)Cl + R2NH → CH3(CH2)3C(O)NR2 + HCl

Benzene reacts under conditions of the Friedel-Crafts reaction to give valerophenone:

CH3(CH2)3C(O)Cl + C6H6 → CH3(CH2)3C(O)C6H5 + HCl


  1. ^ Helferich, B.; Schaefer, W. (1929). "n-Butyryl Chloride". Org. Synth. 9: 32. doi:10.15227/orgsyn.009.0032.