ChemInform Abstract: Hydrogen‐Abstraction Reactivity of Excited‐State Para‐Substituted Benzyl Radicals in Solution at Room Temperature.

Abstract

ChemInform Abstract In contrast to almost no H-abstraction reactivtiy of the ground-state p-X-benzyl radicals (X: -CN, -Cl, -F, -O-Me) toward 1,4-cyclohexadiene (CHD), a significant fluorescence quenching by CHD in hexane at room temp. is confirmed for their fluorescent excited states, which may be assigned to 2B2 for p-cyanobenzyl and 1A2 for the other three p-X-benzyls. The quenching reveals a marked substituent effect.