Photochromic naphthacenequinones, process for their preparation

Details Photochromic naphthacenequinones, process for their preparation Photochromic naphthacenequinones, process for their preparation

1993-02-01

1995-04-18

Pal, Asok

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Organic compound containing

552200, 552201, 552202, C07C 5036

Patent

active

054078857

ABSTRACT:
Compounds of formula I or V or mixtures thereof ##STR1## wherein R is unsubstituted C.sub.6 -C.sub.14 aryl or C.sub.6 -C.sub.14 aryl which is substituted by C.sub.1 -C.sub.12 alkyl, C.sub.1 -C.sub.12 alkoxy, C.sub.1 -C.sub.12 alkylthio, phenyl, benzyl, --CN, --CF.sub.3, halogen or --COOR.sub.5, and R.sub.5 is H, C.sub.1 -C.sub.18 alkyl, cyclohexyl, cyclopentyl, phenyl, C.sub.1 -C.sub.12 alkylphenyl, benzyl or C.sub.1 -C.sub.12 alkylbenzyl, and at least one of the substituents R.sub.1 to R.sub.4 is --F, --Cl or --Br, or is independently the group RO--, and the other substituents R.sub.1 to R.sub.4 are H, --F, --Cl or --Br, are reversible photochromic systems which can be used for contrast formation, light absorption or for the reversible optical storage of information.

REFERENCES:
patent: 4036805 (1977-07-01), Tsujimoto et al.
patent: 5208354 (1993-05-01), Fischer et al.
Y. E. Gerasimenkee et al, Zhurnal Organicheskoi Khimii, vol. 7, No. 11, pp. 2413-2415 (1971).
Y. E. Gerasimenka et al; Zhurnal Organicheskoi Khimii, vol. 16, No. 9, pp. 1938-1945 (1980).
Chem. Abst. vol. 94 No. 7, 47012m (1980).

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