Photochromic naphthacenequinones, process for their preparation

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

1991-01-10

1993-01-05

Ivy, C. Warren

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

Organic compounds

Tetracyclo naphthacene configured ring system having at...

C07C 5022

Patent

active

051772272

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 alkylthiol, 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 an organic thiol, sulfoxyl or sulfonyl group, and the other members R.sub.1 to R.sub.4 are H, F, Cl or Br, are reversible photochromic systems which can be used for contrast formation or light absorption.

REFERENCES:
patent: 5001243 (1991-03-01), Fischer et al.
Abstract, Dyes and their Intermediate, 1968, p. 8.
Y. E. Gerasimenko, et al., Z. Org. Khim, 7, 2413 (1971).
Y. E. Gerasimenko et al., Z. Org. Khim. 16, 1938 (1980).

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