THE ROLE OF QUINONE METHIDES IN THERMOSTABILIZATION OF HYDROCARBON POLYMERS .1. FORMATION AND REACTIVITY OF QUINONE METHIDES

摘要

The structures and properties of quinone methides(QM) formed by mono-electron oxidation from two commercially important classes of phenolic antioxidants are reviewed. Dimerisation of QM derived from the benzyl-type phenols is controlled by the steric hindrance on the exocyclic methylene group. Isomerisation of QM derived from the propionate-type phenols results in regeneration of the phenolic function. (C) 1996 Elsevier Science Limited [References: 55]