| 摘要 |
The invention relates to photochromic compounds of general formula: <IMAGE> (I) in which: Ra and Rb denote hydrogen; alkyl; OR, SR, COR or COOR where R denotes hydrogen, alkyl, aryl or heteroaryl; a group NR1 R2 where R1 R2 denotes hydrogen, C4-C7 alkyl or cycloalkyl, aryl, or form with the nitrogen a C4-C7 heterocycle; NO2, CN, SCN or a halogen; a group SO3R' where R' denotes hydrogen or an alkali metal; a mono- or polyhaloalkyl; m denotes an integer from 1 to 4 and n is equal to 1 or 2; Cy denotes an aromatic ring or an aromatic or non-aromatic heterocycle; Rc denotes an alkyl, allyl, phenyl or arylalkyl group which is mono- or disubstituted with alkyl, alkoxy or NO2; an alicyclic, an aliphatic hydrocarbon containing one or more hetero atoms; Rd, Re, Rf and Rg denote hydrogen, alkyl, alkoxy or thioalkyl or form in pairs a 4- to 7-membered cycloalkyl possibly containing hetero atoms which are optionally condensed with an aromatic ring; Rh denotes hydrogen or forms with Rd a 5- or 6-membered cycloalkyl; and the use thereof in ophthalmic optics.
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