Abstract: S-trifluorobutenyl thiocarbonic acid esters of the formula ##STR1## and salts thereof, wherein X is R.sup.1 N or S and Y is RS or R.sup.3 R.sup.2 N;wherein R is a metal or a radical selected from alkyl, cycloalkylalkyl, halocycloalkylalkyl, alkenyl, haloalkyl, haloalkenyl, alkynyl, alkoxyalkyl, alkylthioalkyl, alkoxycarbonylalkyl, halophenoxyalkyl, trialkylsilylalkyl, (vinyl)dialkylsilylalkyl, (allyl)dialkylsilylalkyl, 2-chlorothiophene-5-ylmethyl, phenylalkyl, halophenylalkyl, nitrophenylalkyl, haloalkylphenylalkyl, dialkyl-2,3-dihydrobenzofuran-7-yl, [2-methyl-(1,1'-biphenyl)-3-yl]methyl, 3-phenoxybenzyl, phenylthioalkyl, halophenylthioalkyl, dialkylphosphoryl, dialkylthiophosphoryl, dialkylisoxazolylalkyl and thienylisoxazolylalkyl;wherein R.sup.1 is alkyl, cycloalkyl, cyano, dialkyl-2,3-dihydrobenzofuran-7-yl, halophenyl, halophenylalkyl, haloalkoxyphenyl, pyridinyl, halopyridinyl, alkyl-1,3,4-thiadiazolyl, haloalkyl-1,3,4-thiadiazolyl, benzothiazolyl, dialkyloxazolyl or thiazolinyl;wherein R.sup.