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    • 2. 发明授权
    • Method of preparing 2-phenyl benzotriazoles
    • 制备2-苯基苯并三唑的方法
    • US5187289A
    • 1993-02-16
    • US740868
    • 1991-07-31
    • Naohiko FukuokaKazunobu KubotaKunitoshi Iguchi
    • Naohiko FukuokaKazunobu KubotaKunitoshi Iguchi
    • C07D249/20
    • C07D249/20
    • A method of preparing 2-phenylbenzotriazoles expressed by Formula I: ##STR1## (wherein R.sub.1 denotes a hydrogen or chlorine atom, a lower alkyl group having 1 to 4 carbon atoms, a lower alkoxyl group having 1 to 4 carbon atoms, a carboxyl group or a sulfonic acid group; R.sub.2 denotes a hydrogen or chlorine atom, a lower alkyl group having 1 to 4 carbon atoms or a lower alkoxyl group having 1 to 4 carbon atoms; R.sub.3 denotes a hydrogen or chlorine atom, an alkyl group having 1 to 12 carbon atoms, a lower alkoxyl group having 1 to 4 carbon atoms, a phenyl group, a phenyl group substituted by an alkyl group having 1 to 8 carbon atoms, a phenoxy group or a phenylalkyl group with an alkyl part having 1 to 4 carbon atoms; R.sub.4 denotes a hydrogen or chlorine atom, a hydroxyl group or an alkoxyl group having 1 to 4 carbon atoms; and R.sub.5 denotes a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or a phenylalkyl group with an alkyl part having 1 to 4 carbon atoms) comprises reduction with hydrogen of o-nitroazobenzene derivatives expressed by Formula II: ##STR2## (wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 each denote the same as in Formula I), the reduction being effected in a solvent containing water.
    • 由式I表示的2-苯基苯并三唑的制备方法:其中,R1表示氢或氯原子,碳原子数1〜4的低级烷基,碳原子数1〜4的低级烷氧基,羧基 或磺酸基; R2表示氢或氯原子,碳原子数1〜4的低级烷基或碳原子数1〜4的低级烷氧基; R3表示氢或氯原子,具有1〜 12个碳原子,具有1〜4个碳原子的低级烷氧基,苯基,被碳原子数1〜8的烷基取代的苯基,苯氧基或具有1〜4个碳原子的烷基部分的苯基烷基 原子; R4表示氢或氯原子,羟基或碳原子数1〜4的烷氧基,R5表示氢原子,碳原子数1〜12的烷基或烷基部分的苯基烷基为1 至4个碳原子)包括用氢还原 由式II表示的邻硝基偶氮苯衍生物:其中R 1,R 2,R 3,R 4和R 5各自表示与式I中相同的基团),所述还原是在含有水的溶剂中进行的。