Method for synthesizing spiro-oxazines
AssigneePPG Industries, Inc.
InventorWon S. Kwak
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Abstract
Photochromic spiro-oxizine compounds are prepared by mixing in a substantially non-reactive organic solvent medium an alkylidene heterocyclic compound or halide salt thereof, e.g., an indoline, with a metal chelate of an ortho-hydroxynitrosoaromatic compound.
Claims20
A process of synthesizing a spiro-type compound comprising mixing an unsubstituted or substituted first compound selected from the group consisting of 2-methyleneindoline, 2-methylenebenzothiazoline, 2-methylenebenzoxazoline, or a halide salt thereof and a metal chelate of either an ortho-hydroxynitrosoaromatic compound or a substituted ortho-hydroxynitrosoaromatic compound, the aromatic compound selected from the group consisting of benzene, naphthalene, coumarin, quinoline, isoquinoline benzofuran, benzoxazine, isocoumarin, benzopyran, pyridine or chromone, in a solvent at temperatures sufficient to cause reaction of the first compound and the metal chelate.
A process of synthesizing a spiro-type compound comprising mixing an unsubstituted or substituted 2-methyleneindoline or a halide salt thereof and a metal chelate of either an ortho-hydroxynitrosoaromatic compound or of a substituted ortho-hydroxynitrosoaromatic compound, the aromatic compound selected from the group consisting of benzene, naphthalene, coumarin, quinoline, isoquinoline, benzofuran, benzoxazine, isocoumarin, benzopyran, pyridine or chromone, in a solvent at temperatures sufficient to cause reaction of the methyleneindoline compound and the metal chelate.
Dependencies are inferred from the claim text.