Patent ID: 8853425

Claim:
A process for the preparation of a benzodithiophene compound having general formula (I): wherein: R 1 and R 2 are each independently selected from a hydrogen atom, a linear or branched C 1 -C 20 alkyl group, a cycloalkyl group and an aryl group, said groups being optionally substituted; R 3 is selected from: a hydrogen atom H, —CHO or —CN; a group selected from R, —OR, —COR, —COOR and R—O—[CH 2 —CH 2 —O] n — wherein R is a linear or branched C 1 -C 20 alkyl group, a cycloalkyl group optionally substituted or an aryl group optionally substituted, and n is an integer ranging from 1 to 4; a —R′OR 4 group wherein R′ represents a linear or branched C 1 -C 20 alkylene group and R 4 is selected from H, a linear or branched C 1 -C 20 alkyl group, and a polyethyleneoxyl group R 5 —[—OCH 2 —CH 2 —] n — wherein R 5 is a C 1 -C 20 alkyl group and n is an integer ranging from 1 to 4; X is selected from a nitrogen atom and a CR 6 group, wherein R 6 is selected from a hydrogen atom, a linear or branched C 1 -C 20 alkyl group, a cycloalkyl group optionally substituted, an aryl group optionally substituted, a heteroaryl group optionally substituted, a —CHO group, a —CN group, a Y group selected from —COR, a —COOR group, and a —CONR 2 group, wherein R is selected from a linear or branched C 1 -C 20 alkyl group, a cycloalkyl group optionally substituted and an aryl group optionally substituted, wherein said process comprises reacting a derivative of 3,3′-bithiophene having general formula (II): wherein X and R 3 have the same meanings described above, with at least one internal alkyne having general formula (III) wherein R 1 and R 2 have the meanings described above.