An absolute asymmetric synthesis of the (2 + 2) cycloadduct via single crystal-to-single crystal transformation by charge-transfer excitation of solid-state molecular complexes composed of arylolefins and bis(1,2, 5)thiadiazolotetracyanoquinodimethane

Study of charge-transfer (CT) excitation of solid-state molecular complexes that induced single crystal-to-single transformation revealed the electron transfer (ET) process to be the initiator of solid state chemical reactions. Excitation of CT bands produced certain photoreactions characteristic of solid-state reactions. CT crystals exhibit electrical conduction and ferromagnetic behavior.