Synthesis and properties of the ttf donors with a five-membered cyclic o,o-, s,s-, or o, s-acetal

Synthesis of the TTF (tetrathiafulvalene) donors with a 1,3-dioxolane, 1,3-dithiolane, or 1,3-oxathiolane ring (1–3) has been accomplished via (MeO)3P-promoted cross-coupling reaction of the corresponding new ketones (6–8) and thiones (9a-c). Although an X-ray diffraction analysis of the neutral 2a revealed that its molecular structure is nonplanar, its radical-cation salts with AuI2−, BF4−, and AsF6− exhibited metallic conducting behavior.