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    • 7. 发明授权
    • Method of preparing mixtures of bromophenols and benzoquinones
    • 制备溴苯酚和苯醌混合物的方法
    • US06693221B1
    • 2004-02-17
    • US10406061
    • 2003-04-04
    • Ryan Christopher MillsTimothy Leigh Chuck
    • Ryan Christopher MillsTimothy Leigh Chuck
    • C07C3924
    • C07C46/08C07C37/62C07C50/02C07C50/04C07C39/27
    • A method is described for the simultaneous preparation of 4-bromophenols and p-benzoquinones, intermediates useful in the preparation of hydroquinones and 4,4′-dihydroxybiphenyls respectively. Hydroquinones and 4,4′-dihydroxybiphenyls are useful monomers for the preparation of a variety of polymers. In one example phenol is reacted with in the presence of HBr, a catalytic amount of cupric bromide and a stoichiometric excess of oxygen under relatively mild conditions to provide a mixture of the phenol, 4-bromophenol, and 1,4-benzoquinone. Phenol conversion was 54 percent and selectivities for bromophenol and benzoquinone were 23% and 37% respectively. Limiting the amount of HBr present in the reaction mixture was shown to control the amount of benzoquinone produced.
    • 描述了同时制备4-溴苯酚和对苯醌的方法,分别用于制备氢醌和4,4'-二羟基联苯的中间体。 氢醌和4,4'-二羟基联苯是用于制备各种聚合物的有用单体。 在一个实例中,苯酚在相对温和的条件下,在HBr存在下,催化量的溴化铜和化学计量过量的氧气反应,以提供苯酚,4-溴苯酚和1,4-苯醌的混合物。 苯酚转化率为54%,溴苯酚和苯醌的选择性分别为23%和37%。 显示出限制反应混合物中存在的HBr的量来控制所产生的苯醌的量。