摘要:
The first synthesis of four of the 16 possible isomeric branched quarterthienyls (thienylterthiophenes) is reported. Thus, 5'-(2-thienyl)-2,2':3',2''-terthiophene, 5'-(2-thienyl)-2,2':3',3''-terthiophene, 5'-(3-thienyl)-2,2':4',2''-terthiophene, and 5'-(3-thienyl)-2,2':4',3''-terthiophene, 2a-5a, were synthesized from the respective trithienyl-1,4-butanediones 10-13, which were obtained in good yield via the Stetter reaction. The structures of 2a-5a were supported by 2D COSY spectra.