Process for the preparation of isothiocyanates

Details Process for the preparation of isothiocyanates Process for the preparation of isothiocyanates

C - Chemistry, Metallurgy

07

C

260/454.5

C07C 331/28 (2006.01)

Patent

CA 2033129

There is disclosed a process for the preparation of isothiocyanates of formula Image wherein R 1 and R 2 are each independently of the other C 1-C 6alkyl and R 3, R 4 and R 5 are each independently of the other hydrogen, halogen, C 1-C 4alkyl, C 1-C 4alkoxy, trifluoro- methyl or nitro, which process comprises reacting an amine of formula Image with ammonium thiocyanate or an alkali metal thiocyanate, in the presence of acid and an inert solvent, to the thiourea of formula Image and cleaving said thiourea by heating. The essential feature of this process consists in carrying out the reaction of the amine of the above formula with ammonium thiocyanate or an alkali metal thiocyanate in the presence of 0.5-5% by weight of water, based on the total weight of the reaction mixture. The isothiocyanates of the above formula are intermediates for the synthesis of pesticidal compounds.

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