Attempts at Direct Detection of Reactive Species in Selective Excitation of the Contact Charge Transfer Pairs of Hexamethylbenzene and Oxygen

Article abstract of DOI:10.1246/bcsj.68.277

Pulsed laser excitation of contact charge transfer pairs of hexamethylbenzene (HMB) and oxygen in methanol-acetonitrile gave no evidence for intermediacy of reactive species such as HMB radical cations and penthamethylbenzyl cations (ArCH2⁺), though stationary irradiation of the pair in hydroxylic solvents afforded distinct products arising from the cationic species.The mechanism of reactions was discussed in comparison with 9,10-dicyanoanthracene-sensitized oxygenation of HMB.