What is acetyl chloride?

Acetyl chloride or ethanoyl chloride is an organic compound derived from acetic acid, substituting a hydroxil group OH- for a chlorine ion Cl-. Its molecular formula is CH3COCl, and its molar mass is 78.49 grams per mole.

Cameo Chemicals notes that acetyl chloride is a highly-flammable, colorless liquid which emanates powerful odors. Its vapors are more dense than air, and they irritate the eyes and mucous membranes on contact. Acetyl chloride does not exist independently in nature, as its contact with water provokes a violent reaction producing acetic acid and hydrogen chloride. It is considered to be a highly hazardous substance; therefore, it must be handled with special care.