Substituted 5-aryl-2-(2-hydroxyphenyl)-2H-benzotriazole UV absorbers, compositions stabilized therewith and process for preparation thereof
申请人:——
公开号:US20040192927A1
公开(公告)日:2004-09-30
Compounds of formula I or II
1
where R is an aryl moiety, such as phenyl, naphthyl or biphenylyl, or is phenyl substituted by one or more trifluoromethyl, bromo or cyano, and E
1
and E
2
are independently hydrogen, alkyl, aralkyl and the like are prepared by reaction of a benzotriazole substituted on the 5-position of the benzo ring by a halogen atom with a arylboronic acid or ester in the presence of a transition-metal catalyst, such as palladium (II) diacetate. The benzotriazole compounds of formula I are particularly efficacious as stabilizers for automotive coatings and candle wax.
化合物的公式I或II1,其中R是芳基基团,例如苯基,萘基或联苯基,或是被一个或多个三氟甲基,溴或氰取代的苯基,E1和E2独立地是氢,烷基,芳基烷基等,通过苯并三唑在苯环的5位被卤素原子取代,与芳基硼酸或酯在过渡金属催化剂的存在下,例如二乙酸钯(II)反应制备而成。公式I的苯并三唑化合物特别适用于汽车涂料和蜡烛蜡的稳定剂。