| 摘要 |
PURPOSE:To prepare the titled substance having excellent radiation resistance and flame retardance, with simple operation, by brominating easily available acenaphthene in the presence of a specific catalyst and solvent, condensing the product, brominating the benzyl part with a radical initiator, and dehydrobrominating the product. CONSTITUTION:A brominated acenaphthylene condensate having the unit of formula I or formula II (n and n' are 1-5) as a constituent unit, is prepared by (1) brominating and simultaneously condensing acenaphthene with bromine in a halogenated hydrocarbon in the presence of a Lewis acid catalyst at 10-60 deg.C, (2) removing the Lewis acid catalyst from the system, and brominating the condensate in the presence of a radical initiator (e.g. benzoyl peroxide) at 30-100 deg.C, and (3) dissolving the brominated acenaphthene obtained by the second step in an inert solvent and carrying out dehydrobromination reaction with a base at 30-100 deg.C. |
