| 摘要 |
PURPOSE:To obtain the titled compound in high purity and yield, by dispersing a specific amount of water and bisphenol A in a specific amount of chlorobenzene, reacting with bromine under specific condition and carrying out the aging of the product at a specific temperature, the separation of the aqueous layer and the washing of the organic layer. CONSTITUTION:Bisphenol A (BPA) is made to react with a prescribed amount of bromine in a heterogeneous solvent to obtain the titled compound useful as a flame retardant for epoxy polymer, etc. In the above process, 1pt. of BPA and 1-4pts. of water are dispersed in 1-10pts. of chlorobenzene as a solvent and bromine is added to and reacted with the dispersion at 10-25 deg.C. After the addition of the whole bromine, the system is maintained at the above temperature for >=1hr and aged by heating at 70-90 deg.C. The unreacted bromine is decomposed at the same temperature, the aqueous layer is separated and the organic layer is washed. If necessary, a part of chlorobenzene is recovered, the organic layer is cooled and the objective compound is crystallized to obtain the compound in high purity and yield without using complicated purification process.
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