| abstract |
R 1 , R 2 , R 3 einen oder mehrere Substituenten aus der Reihe -H, -CN, -SCN, -NO 2 , -X, -CH 2 X, -CX 3 (X= Halogen), -OR. -SR, -COR, -COOR (R=H, Alkyl mit bis zu 8 C-Atomen, Aryl, Heteroaryl), >Ar (annelierte aromatische oder heteroaromatische Ringsysteme) R 4 , R 5 , R 6 , R 7 ein Substituent aus der Reihe -H, -R, -CH 2 R, -NH 2 , -NHR, -NR 2 , -OR, -SR (R=Alkylrest mit bis zu 8 C-Atomen, Aryl oder Hetero- arylrest), wobei mindestens einer der Reste R 4 , R 5 oder R 6 nicht Methyl ist, falls R 7 = H ist. die als photochrome Verbindungen beispielsweise für Brillengläser aus Kunststoff geeignet sind. Compounds of the general formula are described where the radicals R are: R 1 , R 2 , R 3 one or more substituents from the series -H, -CN, -SCN, -NO 2 , -X, -CH 2 X, -CX 3 (X = halogen), -OR. -SR, -COR, -COOR (R = H, alkyl with up to 8 carbon atoms, aryl, heteroaryl),> Ar (fused aromatic or heteroaromatic ring systems) R 4 , R 5 , R 6 , R 7 is a substituent from the series -H, -R, -CH 2 R, -NH 2 , -NHR, -NR 2 , -OR, -SR (R = alkyl radical with up to 8 carbon atoms, aryl or heteroaryl radical), where at least one of the radicals R 4 , R 5 or R 6 is not methyl if R 7 = H. which are suitable as photochromic compounds, for example for plastic eyeglass lenses. n n n The compounds according to the invention have the advantage that the photochromic effect is less dependent on temperature than in the case of known compounds.n n n In preferred embodiments of the invention, the molecules have positive thermochromism in addition to the photochromic effect. |