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Environmental fate & pathways


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Description of key information

Parent compound butyryl chloride: In contact with water the substance will hydrolyse rapidly.
Hydrolysis product butyric acid: The substance is readily biodegradable.

Key value for chemical safety assessment

Additional information

Parent compound butyryl chloride: Based on a weight-of-evidence approach, butyryl chloride is determined to hydrolyse rapidly to butyric acid and HCl. This is confirmed by read across to the analogue substances stearoyl chloride (CAS 112 -76 -5), 2 -ethylhexanoyl chloride (CAS 760 -67 -8), pivaloyl chloride (CAS 3282 -30 -2), neodecanoyl chloride (CAS 40292 -82 -8) and nonanyl chloride (CAS 764 -85 -2). All these compounds hydrolyse rapidly (<< 24 h) to the corresponding acid and HCl.

The measured data are supported by HYDROWIN 2.00 data which indicate that acyl halides usually have hydrolytic half-lives of less than 10 minutes.


Hydrolysis product butyric acid: In accordance with column 2 of REACH Annex VII, the study does not need to be performed if the substance is readily biodegradable or inorganic. Butyryl chloride hydrolyses rapidly and forms butyric acid and HCl. Butyric acid is readily biodegradable (Urano & Kato, 1986), while HCl is inorganic.

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