BDH-TTP as a structural isomer of BEDT-TTF, and its analogue: synthesis and properties

Synthesis of a structural isomer of BEDT-TTF [bis(ethylenedithio)tetrathiafulvalene], namely BDH-TTP [2,5-bis(1,3-dithiolan-2-ylidene)-1, 3,4,6-tetrathiapentalene 1], and its related donor DHDA-TTP [2-(1,3-dithiolan-2-ylidene)-5-(1,3-dithian-2-ylidene)-1, 3,4,6-tetrathiapentalene 2] was accomplished via the Me3Al-promoted reaction. A new donor 1 produced the metallic radicalcation salts stable down to very low temperatures with the anions examined, one of which possessed the κ-type donor arrangement.