| 摘要 |
A p-diphenol is oxidized to a p-quinone with oxygen in presence of rhodium which has been pretreated with a reducing agent. The p-diphenol may be that produced in a process for making vinyl esters of C1-4 aliphatic carboxylic acids (e.g. vinyl acetate) from ethylene and the acid in presence of a p-quinone, a halide of Pt, Os, Ir, Pd, Rh or Ru and an alkali metal salt of the acid, in which case the regenerated p-quinone is used in a further such process. Specified quinones are benzoquinone, 2-methyl-benzoquinone and chloro-, bromo- and 2,5-dichlorobenzoquinones. |
