发明名称 |
PROCESSES FOR THE PREPARATION OF BENZOTRIAZOLE UV ABSORBERS |
摘要 |
Provided is a process for preparing 2H-benzotriazole UV absorbers containing a perfluoroalkyl moiety at the 5-position of the benzo ring, for example a trifluoromethyl group, which involves diazotizing the perfluoroalkyl substituted o-nitroaniline using concentrated sulfuric acid plus sodium nitrite or nitrosylsulfuric acid to form the corresponding monoazobenzene intermediate via the diazonium salt intermediate which is reduced to the corresponding 5-perfluoroalkyl substituted 2H-benzotriazole UV absorber compound by conventional reduction means. Also provided is a novel one-pot, multiphase reaction for the preparation of 2(2-nitrophenylazo) substituted phenols, which are precursors for 2H-benzotriazole UV absorbers.
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申请公布号 |
CA2416356(A1) |
申请公布日期 |
2002.02.14 |
申请号 |
CA20012416356 |
申请日期 |
2001.07.26 |
申请人 |
CIBA SPECIALTY CHEMICALS HOLDING INC. |
发明人 |
BABIARZ, JOSEPH EDMUND;XIONG, RONG;LAU, JACQUELINE;NAUGHTON, ANDREW B.;DEHESSA, DEBORAH;WOOD, MERVIN GALE;SANDERS, JEROME |
分类号 |
C07C245/08;C07D249/20;(IPC1-7):C07D249/20;C08K5/347 |
主分类号 |
C07C245/08 |
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