Elektrochemische Carboxylierung von Cinnamoyl-1,1-bis(alkylthio)-ethylenen

Electrochemical Carboxylation of Cinnamoyl-1,1-bis(alkylthio)ethylenes Cinnamoyl-1,1-bis(alkylthio)ethylenes ( 1a–1h ) are reduced electrochemically in the presence of carbondioxide in aprotic media. The attack of CO₂ takes place either in 1- or 5-position of cinnamoyl-1, 1-bis(alkylthio)ethylenes ( 1a–1h ) depending on the nature of the aryl substituents. If CO₂ reacts in position 1 carbonic acids 3 are obtained, reaction of carbondioxide in 5- position leads to the acids 2 . The effects of different aryl substituents on the halfwave potentials and the preparative electrolyses have been investigated.