Photochromic naphthacenequinones, process for their preparation

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

1992-05-08

1993-04-27

Cintins, Marianne M.

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

Organic compounds

Tetracyclo naphthacene configured ring system having at...

C07C 5036

Patent

active

052063950

ABSTRACT:
Compounds of the 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.16 l-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 thio, 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.
Y. E. Gerasimenkee et al. Z. Org. Khim, 7 2413 (1971).
Y. E. Gerasimenkee et al. Z. Org. Khim 16, 1938.
Abrahart, Dyes and their Intermediates (1968) p. 8.

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