Novel maleimide-type acceptors based on annelated 1,4-dithiins

Abstract

Bis(tetraethylammonium) bis-(2-thioxo-1,3-dithiole-4,5-dithiolato)zincate(II)5 reacted with a range of 3,4-dichloromaleimides 4(R = H, alkyl or aryl) to give a new annelated 1,4-dithiin system 6 in high yield. Oxidation of the thiones 6 gives the corresponding [1,3]-dithiolones 7. Cyclic voltammetry indicates that the new compounds are electron acceptors.