Process for the production of alkyl thiochloroformates

Details Process for the production of alkyl thiochloroformates Process for the production of alkyl thiochloroformates

1987-10-16

1989-04-11

Ford, John M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Esters having the thiocarboxylate group, -cx-, wherein the...

C07C 6802

Patent

active

048208566

ABSTRACT:
The subject of the invention is a new process for the preparation of alkyl thiochloroformates.
The process according to the invention consists in reacting phosgene with a mercaptan in the presence of a catalyst which is a hexaalkylguanidinium chloride or the corresponding hydrochloride of general formula: ##STR1## in which R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 represent alkyl radicals containing 1 to 4 carbon atoms and in which n may take either the value 0 or the value 1.
The preferred catalysts are hexamethylguanidinium chloride and its hydrochloride.
The process according to the invention enables very pure alkyl thiochloroformates to be obtained with milder operating conditions and simplified purification operations.

REFERENCES:
patent: 3277143 (1966-10-01), Tilles
patent: 4268456 (1981-05-01), Keim et al.
patent: 4273725 (1981-06-01), Cook, Jr.
patent: 4340746 (1982-07-01), Semler et al.
Dehmlow, et al., Phase Transfer Catalysis, Verlag Chemie, Weinheim, (1980), pp. 46-48.

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