| 摘要 |
PURPOSE:To prepare the titled substance having excellent flame retardance and radiation resistance and high stability, easily, by carrying out the bromination, condensation and dehydrobromination reactions of acenaphthene in a halogenated hydrocarbon in the presence of an iron catalyst under specific temperature condition using >=3mol of bromine based on 1mol of the raw material. CONSTITUTION:A brominated acenaphthylene condensate having the unit of formula I or formula II (n and n' are 1-5) as constituent unit, is prepared by (1) brominating and condensing acenaphthene in a halogenated hydrocarbon solvent (e.g. carbon tetrachloride) in the presence of (preferably about 0.01-0.2mol per 1mol of acenaphthene of) an iron catalyst at >=60 deg.C, preferably 70-170 deg.C, using >=3mol, preferably >=4mol of bromine based on 1mol of acenaphthene, under normal pressure, and (2) dissolving the obtained brominated acenaphthene condensate in an inert solvent, and carrying out dehydrobromination reaction in the presence of a base such as methanol-potassium hydroxide, etc. |
