Process for making triazine UV absorbers using lewis acids and reaction promoters
申请人:CYTEC Technologies Corp.
公开号:US20010020094A1
公开(公告)日:2001-09-06
It has been now surprisingly discovered after extensive research that 2-halo-4,6-bisaryl-1,3,5-triazine can be prepared with unprecedented selectivity, efficiency, mild conditions, and in high yield by the reaction of cyanuric halide with aromatics in the presence of at least one Lewis acid and at least one reaction promoter. This reaction is also unprecedently general as a variety of aromatics can be used to produce a wide selection of 2-halo-4,6-bisaryl-1,3,5-triazines. The novel approach includes the use of the reaction promoters in combination with at least one Lewis acid under certain reaction conditions to promote the formation of 2-halo-4,6-bisaryl-1,3,5-triazine compounds from cyanuric halide. Preferably, the Lewis acids and reaction promoters are combined to form a complex. 2-Halo-4,6-bisaryl-1,3,5-triazines are key intermediates for making 2-(2-oxyaryl)-4,6-bisaryl-1,3,5-triazine class of UV absorbers.
经过广泛的研究,令人惊讶地发现,通过氰尿酸卤化物与芳香族化合物在至少一种路易斯酸和至少一种反应促进剂的存在下反应,可以以前所未有的选择性、效率、温和条件和高产率制备2-卤代-4,6-双芳基-1,3,5-三嗪。该反应具有前所未有的广泛性,因为可以使用各种芳香族化合物来生产各种2-卤代-4,6-双芳基-1,3,5-三嗪。新的方法包括在特定反应条件下,将反应促进剂与至少一种路易斯酸结合使用,促进从氰尿酸卤化物中形成2-卤代-4,6-双芳基-1,3,5-三嗪化合物。最好将路易斯酸和反应促进剂组合形成复合物。2-卤代-4,6-双芳基-1,3,5-三嗪是制备2-(2-氧基芳基)-4,6-双芳基-1,3,5-三嗪类紫外线吸收剂的关键中间体。