Thionyl chloride can engage in a range of different electrophilic addition reactions. It adds to alkenes in the presence of AlCl₃ to form an aluminium complex which can be hydrolysed to form a sulfinic acid.

What does SOCl2 react with?

SOCl2 Reaction with Carboxylic Acids. Acyl chlorides can be prepared by reacting carboxylic acids with thionyl chloride (SOCl₂), phosphorous trichloride (PCl₃) or phosphorous pentachloride (PCl₅): In the bases of this transformation is the conversion of the OH group into a good leaving.

Does thionyl chloride react with amines?

Reaction with nitrogen nucleophiles

Thionyl chloride reacts with amines, imines, hydrazines, and related compounds to give open- chain or heterocyclic compounds.