The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 21, 2000
Filed:
Jul. 20, 1998
Ciba Specialty Chemicals Corporation, Tarrytown, NY (US);
Abstract
There is described a process for the production of a 1,3-benzoxazin-4-one having the formula: ##STR1## in which R.sub.1 and R.sub.2, independently, are hydrogen, cyano, halogen, nitro, C.sub.1 -C.sub.20 alkyl, O--C.sub.1 -C.sub.20 alkyl, phenyl, NH--CO--C.sub.1 -C.sub.20 alkyl, N(R.sub.3).sub.2, SO.sub.2 N(R.sub.3).sub.2, COOR.sub.3 or CON(R.sub.3).sub.2 in which R.sub.3 is hydrogen, cyano, halogen, nitro, C.sub.1 -C.sub.20 alkyl, O--C.sub.1 -C.sub.20 alkyl, phenyl or NH--CO--C.sub.1 -C.sub.20 alkyl, comprising reacting, at elevated temperature, 1 molar equivalent of an o-hydroxybenzamide of formula: ##STR2## in which R.sub.1 has its previous significance, with 2 to 6 molar equivalents of a benzoyl chloride of formula: ##STR3## in which R.sub.2 has its previous significance. The 1,3-benzoxazin-4-ones having the formula (1) so obtained are important intermediates for the production of triazine compounds having excellent absorption spectrum characteristics and good resistance to exposure to UV light.