SYNTHETIC COMMUNICATIONS, 24(12), 1721-1726 (1994 ... Thiophenes derivatives have always been of great interest to the synthetic chemist ... 1) S. Gronowitz, vol.1, p.1-214;P. Cagniant, D. Cagniant, D. Paquer and G. Kirsch, v01.2, p. 119-1 58 in Thiophenes and its derivatives ...