The synthesis of dinaphthothiophenes

The synthesis of dinaphtho1,2-b:2′,3′-d]thiophene ( 6 ), dinaphtho2,1-b:2′,3′-d]thiophene ( 15 ), dinaphtho-1,2-b:1′,2′-d]thiophene ( 20 ), dinaphtho2,1-b:1′,2′-d]thiophene ( 26 ), dinaphtho2,3-b:2′,3′-d]thiophene ( 37 ) and dinaphtho1,2-b:2′,1′-d]thiophene ( 45 ) has been accomplished.