1,3-DITHIENYLISOTHIANAPHTHENE DERIVATIVES AS MODEL COMPOUNDS IN THE STUDY OF THE ELECTRONIC-PROPERTIES OF POLY(ISOTHIANAPHTHENE) DERIVATIVES - AN ALTERNATIVE SYNTHESIS

1,3-dithienylisothianaphthene combines the electronic properties of thiophene and isothianaphthene. The synthesis of 1,2-thienoyl benzene has been accomplished based on a Grignard reaction by adding 2-thiophene magnesiumbromide to 1,2-bis-(S-(2-pyridinyl)) thiobenzoate to obtain 1,2-thienoyl benzene in a yield of 95%. The use of 1,2-bis-(S-(2-pyridinyl)) thiobenzoate avoids the formation of the corresponding 3,3'-bisarylphthalides. The same procedure was applied to obtain 1,3-dithienyl -4,5,6,7-tetrafluoroisothianaphthene.