... Tetrahedron Letters. Volume 51, Issue 10, 10 March 2010, Pages 1364–1366. ... gave 2-iodo-3-phenylthiophene (10) in an excellent yield (entry 9). Treatment of thieno[3,2-b]thiophene 21 with 2 equiv of NCS and NaI afforded the disubstituted product 11 (entry 10). ...