Synthesis and several transformations of sulfides of the thiophene series

Several new N-substituted 2,5-bis(mercapto)-3,4-bis(iminomethyl)thiophenes, which are new tetradentate ligands of the thiophene series, were obtained by the reaction of primary amines with the product formed during the successive action of four equivalents of sodium in liquid ammonia and HCl on the tetraethylacetal of 2,5-bis(methylmercapto)-3,4-thiophenedialdehyde.For Communication XXII, see 4].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1323–1325, October, 1970.