Studies on thiazolidine‐4,5‐dithiones. Synthesis of 5‐hydrazonothiazolidine‐4‐thiones and 5‐unsubstituted thiazolidine‐4‐thiones

Abstract In attempts to generate dithiones 3 , 4‐thioxothiazolidin‐5‐ones 2a — c were converted into hydrazones 4a — c , which, however, could not be thiolyzed. Also thionation of 2a, b did not provide 3 , but resulted in reduction to thiazolidine‐4‐thiones 7a, b .