C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 249/20 (2006.01)
Patent
CA 2359087
5-Sulfonyl substituted benzotriazole UV absorbers are prepared from the corresponding 5-chlorobenzotriazole in a two step, but one-pot process where the second step involves the oxidation of the non-isolated 5-thio substituted benzotriazole using sodium tungstate, hydrogen peroxide and formic acid. The 5- sulfonyl substituted benzotriazoles exhibit enhanced absorption in the near- visible range (over 350 nm) thus providing effective protection to substrates in this critical area of the spectrum.
Cette invention se rapporte à des filtres anti-UV au benzotriazole à substitution 5-sulfonyle, qui sont préparés à partir du 5-chlorobenzotriazole correspondant dans un procédé en deux étapes mais monotope, dans lequel la seconde étape consiste à oxyder le benzotriazole à substitution 5-thio non isolé à l'aide de tungstate de sodium, de peroxyde d'hydrogène et d'acide formique. Ces benzotriazoles à substitution 5-sulfonyle présentent une absorption accrue dans la gamme proche du visible (au-dessus de 350 nm), offrant ainsi une protection efficace au substrat dans cette région critique du spectre.
Blake Catherine
Carpenter Albert
Chen Wha
Wiggins William
Wood Mervin Gale
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
LandOfFree
One-pot process for the preparation of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with One-pot process for the preparation of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and One-pot process for the preparation of... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1536106