Patent ID: 7235671

Claim:
A process for the preparation of a compound 3-chloromethyl-1,2,4-triazolin-5-one of formula (I): comprising reacting a triaryl- or trialkyl-orthoester of formula (II): wherein X is chloro, and each R 1 independently is independently selected from C 1-10 alkyl, and phenyl which is unsubstituted or substituted with halo or C 1-6 alkyl, with a sulfonic acid salt of semicarbazide of formula (III): wherein R 2 is independently selected from C 1-10 alkyl, C 1-10 alkylhalo, C 5-16 cycloalkyl, and phenyl which is unsubstituted or substituted with halo or C 1-6 alkyl, in an organic solvent, and collecting the compound of formula (I).