Useful Wittig reagents in 1,3-dithiole and tetrathiafulvalene (TTF) chemistry: 2-thioxo- and 2-oxo-1,3-dithiol-4-ylmethyl(triphenyl)phosphonium bromides

DIBALH reduction of the methyl ester group of 2-(thi)oxo-1.3-dithioles 1a and 1b selectively affords the corresponding alcohols 3a and 3b which are readily converted into the title compounds 6a and 6b under standard conditions; the latter behave as useful Wittig reagents leading to sulfur-rich and space-extended TTF derivatives.