Dithiochloroformic acid ester

N NaOH added at 0-5 during 15 min. to a soln. of / r/-butylmercaptan and thiophosgene in benzene with stirring, which is continued 2 hrs. dichloromethyl tert-butyl disulfide. Y 90%. Also with AICI3 or CF3COOH, f. e. and formation of dithiochloroformic acid esters, C1C(S)SR, s. N. H. Nilsson, Soc. Perkin I 1974, 1308. 

Chloroformic acid esters (s. a. Dithiochloroformic acid esters)... 

Catalytic amounts of dichlorobis(triphenylphosphine)palladium(II), Cul, and triphenylphosphine added to phenylacetylene, methyl dithiochloroformate, and triethylamine, and the mixture allowed to react at room temp, for 15 h product. Y 90 /o. The more stable a,p-acetylenethionocarboxylic acid esters were obtained from methyl thionochloroformate. Alternatively, both classes of compd. were obtainable via the corresponding a,p-acetyleneiminoester salts. F.e.s. K. Hartke et al.. Tetrahedron Letters 20, 1073-6 (1989). 

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