Process for the production of 2-aryl-2H-benzotriazoles
    2.
    发明授权
    Process for the production of 2-aryl-2H-benzotriazoles 失效
    2-芳基-2H-苯并三唑的制备方法

    公开(公告)号:US4230867A

    公开(公告)日:1980-10-28

    申请号:US855040

    申请日:1977-11-25

    IPC分类号: C07D249/20

    CPC分类号: C07D249/20

    摘要: A process for the production of 2-aryl-2H-benzotriazoles comprises reducing and cyclizing the corresponding o-nitroazobenzenes with hydrogen at a temperature in the range of about 20.degree. C. to about 100.degree. C. and at a pressure in the range of about 15 psia (1 atmosphere) to about 1000 psia (66 atmospheres) in an organic solvent mixture containing an organic amine at a pH over 10 in the presence of noble metal hydrogenation catalyst, preferably palladium. High yields of pure product are obtained with a concomitant reduction of undesired by-products and a reduction in effluent pollution problems.

    摘要翻译: 制备2-芳基-2H-苯并三唑的方法包括在约20℃至约100℃的温度范围内用氢还原和环化相应的邻硝基偶氮,并且在 在含有有机胺的有机溶剂混合物中,在贵金属氢化催化剂,优选钯的存在下,在大于10的pH下,约15psia(1大气压)至约1000psia(66大气压)。 获得高产率的纯产品,伴随着不期望的副产物减少和污水污染问题的减少。