Photochromatic substances

US5637709A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventor

• Manfred Melzig · Weßling, DE

Key dates

• Filing date: Feb 9, 1995
• Grant date: Jun 10, 1997
• Expiry date: Feb 9, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D491/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Polychromatic compounds of pyrans having a substituted adamantane or a polycyclic ring system, with the exception of adamantane, in the 2-position of the pyran ring, having the structure ##STR1## whereby the residues R.sub.1 -R.sub.4 are independently substituents selected from the series H, alkyl, substituted phenyl, phenyl, naphthyl, OH, alkoxy (C.sub.1 -C.sub.4), halogen, alkylamino, dialkylamino, cyan, trifluormethyl, or, R.sub.1 and R.sub.2 or R.sub.3 and R.sub.4 or R.sub.2 and R.sub.3 are constituents of at least one condensed aromatic, heteroaromatic or an alkane ring, wherein said heteroaromatic ring is selected from the group consisting of pyridine, pyrimidine, pyridazine, quinoline, isoquinoline, naphthyridine, quinazoline, quinoxaline, phthalazine, pteridine, phenazine, and benzoquinoline which are substituted by the same residues as R.sub.1 -R.sub.4 above, and wherein the polycyclic ring system is not adamantane and the substituted adamantane contains one or two oxygen, nitrogen or sulfur atoms replacing one or two carbon atoms or is substituted with one or two alkyl moieties.