10. The Diyne Reaction of 3,3′-Bis(phenylethynyl)-2,2′-bithiophene Derivatives via Rhodium Complexes: A Novel Approach to Condensed Benzo[2,1-b:3,4b']dithiophenes

Article abstract of DOI:10.1002/hlca.19970800111

The syntheses of benzo-fused benzo[2,1-b:3,4-b']dithiophenes 1 and benzo[2,1-b:3,4-b':5,6-c″]trithiophenes 2 are described. The treatment of easily available 3,3′-bis(phenylethynyl)-2,2′-bithiophene derivatives 5a and 6 (via Pd^II-catalyzed alky