Synthesis of Selenated Unsymmetrical Analogs of BEDT-TTF, BEDO-TTF and DMET

Abstract

An improved synthesis of EDSEDT-TTF 4 and EDSEDO-TTF 5 from appropriate cross-coupling reactions involving 4,5-bis(2-cyanoethylthio)-1,3-dithiol-2-one (9) and 4,5-bis(2-cyanoethylseleno)-1,3-dithiol-2-one (11) as key intermediates is described. Moreover, a Wittig-type preparation of new selenated derivatives 6 and 7 of DMET molecule from the useful new precursor [4,5-bis(2-cyaoethylseleno)-1,3-dithiol-2-yl]triphenylphosphonium tetrafluoroborate (17) is presented.