| 摘要 |
Brominated biphenols are produced by a bromination process which comprises reacting bromine with a 3,3', 5,5'-tetrasubstituted diphenoquinone at a temperature below about +20 DEG C. in the presence of an inert diluent, evolving hydrogen bromide gas at a temperature of about +20 DEG C. or lower, heating the resulting reaction mixture at elevated temperatures to complete the bromination reaction and recovering the desired 2,2',6,6'-tetrabromo-3,3',5,5'-tetrasubstituted-4,4'-biphenol. The biphenol products of the process can be used as antioxidants, as monomeric starting materials for polymeric halogenated organic compounds which are fire retardant as well as monomeric flame retardant additives for polymeric compositions useful in molding, coating and insulating various articles of manufacture.
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