C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
42/2, 260/236.2
C07C 323/22 (2006.01) C07C 317/24 (2006.01) C09K 9/02 (2006.01) G03C 1/73 (2006.01) G11B 11/10 (2006.01)
Patent
CA 2034316
6-17919/+ Photochromic naphthacenequinones. process for their preparation and the use thereof Abstract of the Disclosure Compounds of formula I or V, or mixtures thereof, Image (I), Image (V), wherein R is unsubstituted C6-C14aryl or C6-C14aryl which is substituted by C1-C12alkyl,C1-C12alkoxy, C1-C12alkylthiol, phenyl, benzyl, -CN, -CF3, halogen or -COOR5, and R5 is H, C1-C18alkyl, cyclohexyl, cyclopentyl, phenyl, C1-C12alkylphenyl, benzyl or C1-C12al- kylbenzyl, and at least one of the substituents R1 to R4 is an organic thiol, sulfoxyl or sulfonyl group, and the other members R1 to R4 are H, F, Cl or Br, are reversible photochromic systems which can be used for contrast formation or light absorption.
Finter Jurgen
Fischer Evelyn
Fischer Walter
Hofmann Manfred
Minder Ernst
Ag Ciba-Geigy
Fetherstonhaugh & Co.
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