Facile Preparation and Charge-Transfer Complexes of Naphtho[1,8-bc:4,5-b′c′]dithiophene and 2,5-Dimethyl and Bis(methylthio) Derivatives
Naphtho[1,8-bc:4,5-b′c′]dithiophene was conveniently prepared via annulation of benzo[1,2-b:4,3-b′]dithiophene and converted to 2,5-dimethyl and bis(methylthio) derivatives. The parent and methylthio compounds have a herringbone type of crystal structures, and formed conductive charge-transfer complexes with iodine and with DDQ.