Photochromic spiropyran compounds

Details Photochromic spiropyran compounds Photochromic spiropyran compounds

1987-05-15

1989-05-02

Thexton, Matthew A.

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

Organic compounds

Chalcogen in the nitrogen containing substituent

548407, 549 24, 549 26, 549 42, 549 43, 549 44, 549 48, 549264, 549331, 549345, 252586, C07D26500, G03C 1733, G02B 2700

Patent

active

048269778

ABSTRACT:
A series of novel photochromic spiropyrans are disclosed in which a spiro-adamantane group is introduced into the 2-position of the benzopyran or naphthopyran ring. The spiropyran compounds of the invention exhibit heliochromic properties, i.e. they color in sunlight and fade rapidly at ambient temperatures in the absence of U.V. light, making them good candidates for use in the manufacture of sunglasses. The invention includes lenses which darken in sunlight and incorporate the novel spiropyrans and a process for the preparation of the spiropyran compounds.

REFERENCES:
patent: 2542386 (1951-02-01), Beakie
patent: 3231584 (1966-01-01), Berman
patent: 3404861 (1966-02-01), Ewer
patent: 3567605 (1971-03-01), Becker
patent: 3627690 (1971-12-01), Casella
patent: 3944637 (1976-03-01), Bond et al.
"Photochemical . . . Chromenes", J. Org. Chem., vol. 40, No. 8, 1975, p. 1142, Padwa.

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