The reaction of peroxynitrite (ONOO−) with a series of para-substituted phenols has been examined in aqueous phosphate buffer and acetonitrile solutions. Major products were the corresponding 2-nitro derivative and the 4-substituted catechol. Kinetic study showed good correlation with Hammett σp+ parameters and reduction potentials, suggesting the possible one-electron transfer process involving the nitrosoniun ion (NO+) as initial electrophile ...