Oxidative intramolecular cyclization of 2,2′-bis(1,4-dithiafulven-6-yl)-3,3′-bithienyls affording novel bis(1,3-dithiole) electron donors

The title bis(1,3-dithiole) compounds containing a 3,3′-bithienyl unit undergo an intramolecular coupling reaction at the 6-positions of the dithiafulvenyl groups by oxidation to give cyclization products in high yields.