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    • 8. 发明授权
    • Process for the preparation of benozotriazoles and their polymers, and
2(2-hydroxy-5-isopropenylphenyl)2H-benzotriazole produced thereby
    • 苯并三唑及其聚合物的制备方法和由此制备的2(2-羟基-5-异丙烯基苯基)-2H-苯并三唑
    • US4812575A
    • 1989-03-14
    • US537219
    • 1983-09-29
    • Otto VoglZohar Nir
    • Otto VoglZohar Nir
    • C07D249/20C08F12/32C08K5/3475
    • C08K5/3475C07D249/20C08F12/32
    • The compound 2(2-hydroxy-5-isopropenylphenyl)2H-benzotriazole (2H5P) is produced by azo coupling of o-nitrophenyl diazonium chloride with p-hydroxyacetophenone, subjecting the resulting isolated azo compound to reductive cyclization with zinc in the presence of sodium hydroxide at a temperature of about 50.degree.-70.degree. C., acidifying the resulting mixture so as to produce (2(2-hydroxy-5-acetylphenyl)2H-benzotriazole (2H5A), acetylating the isolated 2(2-hydroxy-5-acetylphenyl)2H-benzotriazole (2H5A), so as to produce 2(2-acetoxy-5-acetylphenyl)2H-benzotriazole (2A5A), methylating the isolated 2(2-acetoxy-5-acetylphenyl(2H-benzotriazole (2A5A) with a methyl Grignard reagent and dehydrating the isolated reaction product with potassium hydrogen sulfate so as to produce 2(2-hydroxy-5-isopropenylphenyl)2H-benzotriazole (2H5P). The compound is used as a polymerizable ultra violet light stabilizer.
    • 化合物2(2-羟基-5-异丙烯基苯基)2H-苯并三唑(2H5P)是由邻硝基苯基重氮氯化物与对羟基苯乙酮的偶氮偶合产生的,所得到的分离的偶氮化合物在钠存在下用锌还原环化 氢氧化物在约50-70℃的温度下酸化得到的混合物,得到(2(2-羟基-5-乙酰基苯基)-2H-苯并三唑(2H5A),乙酰化分离的2(2-羟基-5 - 乙酰基苯基)-2H-苯并三唑(2H,A),得到2(2-乙酰氧基-5-乙酰基苯基)-2H-苯并三唑(2A5A),甲基化分离的2(2-乙酰氧基-5-乙酰基苯基(2H-苯并三唑(2A5A) 用甲基格氏试剂,用硫酸氢钾脱水分离的反应产物,得到2(2-羟基-5-异丙烯基苯基)-2H-苯并三唑(2H5P),该化合物用作可聚合的紫外光稳定剂。