Patent ID: 8785673

Claim:
A process for producing 2-chloroallyl isothiocyanate of formula (II), comprising reacting 2,3-dichloro-1-propene of formula (III), with a thiocyanate of formula (IV), M(SCN) n (IV), in which M is a metal cation or an ammonium group and n is from 1 to 4, as appropriate for a charge number of the cation, in the presence of a phase transfer catalyst of formula (V), in which moieties R 1 , R 2 , R 3 and R 4 are mutually independently hydrogen, C 1 -C 24 -alkyl, benzyl or C 6 -C 10 -aryl, the latter optionally substituted by halogen, C 1 -C 6 -alkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -alkylamino, C 1 -C 6 -dialkylamino, hydroxy or phenyl and X is an anion, without diluent or in the presence of up to 15 percent by weight, based on 2,3-dichloropropene of formula (III) and simultaneously in the presence of an excess of from 10 to 200 mol percent of 2,3-dichloro-1-propene of formula (III) based on a thiocyanate of formula (IV).