One-pot process for the preparation of 5-sulfonyl-substituted be

Details One-pot process for the preparation of 5-sulfonyl-substituted be One-pot process for the preparation of 5-sulfonyl-substituted be

1999-01-21

2000-03-21

Morris, Patricia L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

544132, 544366, 546199, C07D24920

Patent

active

060404558

ABSTRACT:
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.

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patent: 3766205 (1973-10-01), Heller et al.
patent: 5280124 (1994-01-01), Winter et al.
patent: 5319091 (1994-06-01), DesLauriers et al.
patent: 5436349 (1995-07-01), Winter et al.

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