申请人:Ciba-Geigy Corporation
公开号:US04999433A1
公开(公告)日:1991-03-12
Hologenated 2-(2-hydroxyphenyl)-2H-benzotriazoles of the formula ##STR1## in which X is halogen, R.sub.1 is hydrogen, C.sub.1 -C.sub.12 alkyl, C.sub.5 -C.sub.6 cycloalkyl, phenyl or phenyl-C.sub.1 -C.sub.4 alkyl and R.sub.2 is C.sub.1 -C.sub.12 alkyl, C.sub.5 -C.sub.6 cycloalkyl, phenyl, phenyl-C.sub.1 -C.sub.4 alkyl or a group --C.sub.n H.sub.2n --COOR.sub.3, in which n is 0 to 4 and R.sub.3 is hydrogen or C.sub.1 -C.sub.12 alkyl, can be prepared particularly advantageously by catalytic hydrogenation of a corresponding o-nitroazo compound in the presence of a hydrogenation catalyst consisting of 0.1 to 3% of Pt on a support and of an organic amine.
公式为##STR1##的卤代2-(2-羟基苯基)-2H-苯并三唑,其中X为卤素,R.sub.1为氢、C.sub.1-C.sub.12烷基、C.sub.5-C.sub.6环烷基、苯基或苯基-C.sub.1-C.sub.4烷基,R.sub.2为C.sub.1-C.sub.12烷基、C.sub.5-C.sub.6环烷基、苯基、苯基-C.sub.1-C.sub.4烷基或--C.sub.n H.sub.2n --COOR.sub.3基团,其中n为0至4,R.sub.3为氢或C.sub.1-C.sub.12烷基,可以通过在存在0.1至3% Pt负载物和有机胺的加氢催化剂的情况下催化加氢相应的o-硝基偶氮化合物而特别优选制备。