[EN] TRIAZINE UV ABSORBERS AND A PROCESS FOR THE PREPARATION THEREOF<br/>[FR] ABSORBEURS UV DE TYPE TRIAZINE ET LEUR PROCÉDÉ DE PRÉPARATION
申请人:BASF SE
公开号:WO2021130380A1
公开(公告)日:2021-07-01
The presently claimed invention relates to novel, highly efficient triazine UV absorbers and a general process for the preparation UV absorber compounds from natural precursors.
Process for the preparation of mono- and diaryltriazines
申请人:Ciba-Geigy Corporation
公开号:US05438138A1
公开(公告)日:1995-08-01
A process for the selective preparation of 2,4-dichloro-6-aryl- or 2-chloro-4,6-diaryl-1,3,5-triazines is described, which comprises reacting a compound of formula II ##STR1## wherein X is a bromine or chlorine atom, and R.sup.1 and R.sup.2 are independently hydrogen or alkyl, in tetrahydrofuran with magnesium metal to form the corresponding Grignard reagent, and reacting the resultant solution with cyanuric chloride of formula III ##STR2## such that, if Z is --Cl, at least 1.05 mol and, if Z is a radical of formula Ib, at least 2.1 mol, of Grignard reagent is used per 1 mol of cyanuric chloride. The compounds of formula I can be used with advantage for the preparation of 2-(o-hydroxyphenyl)-4,6-diaryl-s-triazines, which are known light stabilizers for organic material.
Process for making triazine UV absorbers using Lewis acids and reaction promoters
申请人:CYTEC Industries Corp.
公开号:US20020013463A1
公开(公告)日:2002-01-31
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.
Process for Making Trisaryl Triazine UV Absorbers Using Lewis Acids and Reaction Promoters
申请人:Gupta B. Ram
公开号:US20070015920A1
公开(公告)日:2007-01-18
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 promoter's 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.
Process for making trisaryl triazine UV absorbers using Lewis acids and reaction promoters
申请人:Cytec Technology Corp.
公开号:US07485723B2
公开(公告)日:2009-02-03
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.