Convenient synthesis of bis(benzo)-fused BEDT-TTF and higher homologues — new electron donor molecules for organic charge transfer salts and “molecular rulers”

A convenient synthesis of bis(benzo)- and bis(naphtho)-fused bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or ET) derivatives, employing the [4+2] cycloaddition reaction of oligo(1,3-dithiole-2,4,5-trithione) with appropriate alkenes as a key step, is presented.