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    • 67. 发明授权
    • Process for the preparation of 2-hydroxy-4,6-diaryl-1,3,5-triazines
    • 制备2-羟基-4,6-二芳基-1,3,5-三嗪的方法
    • US5288867A
    • 1994-02-22
    • US11931
    • 1993-02-01
    • Dieter ReinehrJean-Pierre Bacher
    • Dieter ReinehrJean-Pierre Bacher
    • C07D251/22C07D251/52
    • C07D251/22
    • There is disclosed a process for the preparation of 2-hydroxy-4,6-diaryl-1,3,5-triazines, which comprises reacting the compound of formula ##STR1## wherein R is hydrogen, C.sub.1 -C.sub.4 alkyl or halogen, with urea, using a base selected from the class of the alkali metal hydrides, alkaline earth metal hydrides, or alkali metal amides, alkaline earth metal amides, or of the alkali metal C.sub.1 -C.sub.4 alcoholates in the presence of a polar solvent, to give the final products in a one step process in which the molar ratio of urea to base is 1:2 to 1:3 and the molar ratio of compound of formula (1) to urea is 2:1 to 5:1.2-Hydroxy-4,6-diaryl-1,3,5-triazines are prepared in very good yield by the inventive process. The compounds are used as intermediates for the synthesis of UV absorbers.
    • 公开了2-羟基-4,6-二芳基-1,3,5-三嗪的制备方法,该方法包括使式(*化学结构*)(1)的化合物(其中R是氢,C1- C4烷基或卤素与尿素反应,使用选自碱金属氢化物,碱土金属氢化物或碱金属氨化物,碱土金属氨化物或碱金属C1-C4醇化物的碱在极性溶剂存在下 在一步法中给出最终产物,其中脲与碱的摩尔比为1:2至1:3,式(1)化合物与脲的摩尔比为2:1至5:1。 通过本发明方法以非常好的收率制备2-羟基-4,6-二芳基-1,3,5-三嗪。 该化合物用作合成UV吸收剂的中间体。