It was found that at neutral pH the hydroxylation reaction rate of phenol was accelerated with an increase of the amounts of 1,4 quinone (1,4 BQ). This acceleration was ascribed to the formation of semiquinone from 1,...It was found that at neutral pH the hydroxylation reaction rate of phenol was accelerated with an increase of the amounts of 1,4 quinone (1,4 BQ). This acceleration was ascribed to the formation of semiquinone from 1,4 BQ. The semiquinone and 1,4 BQ were suggested to play a role of actual oxidant (electron transfer) in the catalytic cycle. With further reaction, most 1,4 BQ was converted into 1,4 hydroquinone (HQ) and the corresponding mechanism was proposed.展开更多
文摘It was found that at neutral pH the hydroxylation reaction rate of phenol was accelerated with an increase of the amounts of 1,4 quinone (1,4 BQ). This acceleration was ascribed to the formation of semiquinone from 1,4 BQ. The semiquinone and 1,4 BQ were suggested to play a role of actual oxidant (electron transfer) in the catalytic cycle. With further reaction, most 1,4 BQ was converted into 1,4 hydroquinone (HQ) and the corresponding mechanism was proposed.
