Process for the production of 2-aryl-2H-benzotriazoles
    3.
    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。

    Process for the preparation of
1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-piperidinol
    4.
    发明授权
    Process for the preparation of 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-piperidinol 失效
    制备1-(2-羟乙基)-2,2,6,6-四甲基-4-哌啶醇的方法

    公开(公告)号:US4731448A

    公开(公告)日:1988-03-15

    申请号:US937600

    申请日:1986-12-03

    IPC分类号: C07D211/46

    CPC分类号: C07D211/46

    摘要: There is disclosed a process for the preparation of 1-(2-hydroxyethyl-2,2,6,6-tetramethyl-4-piperidinol from triacetoneamine, which comprises first reducing triacetoneamine in water and/or a polar organic solvent by catalytic hydrogenation to 2,2,6,6-tetramethyl-4-piperidinol, and adding a catalytic amount of acid to the resultant solution, without isolation of the intermediate, after optional concentration of the solution by distillation, and subsequently reacting the 2,2,6,6-tetramethyl-4-piperidinol with ethylene oxide.1-(2-Hydroxyethyl)-2,2,6,6-tetramethyl-4-piperidinol is a useful light and heat stabilizer for plastics and is, in addition, a valuable intermediate for the synthesis of further light stabilizer additives.

    摘要翻译: 公开了从三丙酮胺制备1-(2-羟基乙基-2,2,6,6-四甲基-4-哌啶醇)的方法,该方法包括首先通过催化氢化在水和/或极性有机溶剂中还原三丙酮胺, 2,2,6,6-四甲基-4-哌啶醇,并且在通过蒸馏任选浓缩溶液后,向所得溶液中加入催化量的酸,而不分离中间体,随后使2,2,6,6-四甲基-4-哌啶醇反应 ,6-四甲基-4-哌啶醇与环氧乙烷,1-(2-羟乙基)-2,2,6,6-四甲基-4-哌啶醇是塑料的有用的光热稳定剂,另外还有一个有价值的 用于合成其它光稳定剂添加剂的中间体。