Substituted 5-aryl-2-(2-hydroxyphenyl)-2H-benzotriazole UV absorbers, compositions stabilized therewith and process for preparation thereof
US6703510B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | Apr 17, 2003 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Apr 17, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D409/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Compounds of formula I or II 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 E1 and E2 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.