| 摘要 |
The present invention relates to a method for the production of substituted trifluoroethylenes, in which a compound of the formula (II) in which R is C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl optionally substituted by carboxyl, halogen, C<SUB>1</SUB>-C<SUB>6</SUB>-alkoxy, C<SUB>1</SUB>-C<SUB>6</SUB>-alkoxycarbonyl or C<SUB>1</SUB>-C<SUB>4</SUB>-alkylcarbonyloxy or is the grouping in which R' and R'' are, independently of one another, hydrogen or C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl or the two, together with the nitrogen atom to which they are bonded, are saturated cycloalkyl with 3 to 5 carbon atoms, in which a ring member is optionally replaced by oxygen or sulfur and which is optionally substituted by one to four C<SUB>1</SUB>-C<SUB>4</SUB>-alkyl, trifluoromethyl or C<SUB>1</SUB>-C<SUB>4</SUB>-alkoxy, and Hal is chlorine, bromine or iodine, preferably chlorine or bromine, is brought into contact with a dehalogenating agent in a water-comprising polar medium.
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