Photochromic Dichroic Naphthopyrans and Optical Articles Containing them

(EN) A naphthopyran compound represented by the formulae (I) to (IV) wherein : � m 1 , m 2 , p, q are each an integer comprised from 0 to 4 or 5 inclusive; � R 1 , R 2 and R 4 , represent a group selected from halogen, H, -R a , aryl, -OH, -OR a , -SH, -SR a , -NH 2 , -NR a R a1 , -NR b R c , -NR a1 COR a , -NR a1 CO(aryl), -NR a1 aryl, -N-aryl 2 , -N(aryl)CO(aryl), -CO-R a , -CO 2 R a1 , -OC(O)-R d , and - X-(R e )-Y, and linear or branched (C 1 -C 18 ) perfluoroalkyl group, wherein R a , R a1 , R b , R c , X, Y, R e , R d are as defined into the description; � Z 1 represent a group selected from: wherein R 3 , J and n are as defined into the description; � R 5 , Z 2 , Z 3 are as defined into the description; � Z 4 represent a group selected from: o wherein R 3 , J and n are as defined hereinbefore; � with the provision that for compounds of formula (II) when Z 1 represents a group then Z 3 is not a hydrogen.