In the preceding communication,'a new heterocyclic ring system, 1, 3, 4, 6-tetrathiapentalene (abbreviated thiapen) was prepared as a 2, 5-bis (dialkyliminium) salt by reacting a dialkylcarbamate with methyl dichloroacetate, followed by cyclization in acid. Attempts to convert the iminium groups to functional groups suitable for the elaboration of tetrathiafulvalene derivatives2 were unsuccessful. This problem has been circumvented ...
