3H-Naphtho[2,1-b]pyrans as Photochromic Dichroic Dyes and Optical Articles Containing Them

Abstract

A naphthopyran compound represented by the formula (I): wherein: n1, n2, p, q is an integer comprised from 0 to 5 inclusive; m is an integer comprised from 0 to 4 inclusive; R1 and R2 represent a group selected from halogen, -Ra, -OH, -ORa, - SH, -SRa, -NH2, -NRaRa1, -NRbRc, -CO-Ra, and -CO2Ra1, wherein Ra, Ra1, Rb and Rc, are as defined in the description ; R3 represents a group selected from halogen, -Ra, -OH, -ORa, -SH, -SRa, -NH2, and -NraRa1; R4 represents a group selected from halogen, -Ra, -OH, -ORa, -SH, -SRa, -NH2, -NRaRa1, -CO-Ra, and -CO2Ra1; R5 represents a group selected from: o halogen, -Ra, -OH, -ORa, -SH, -SRa, -NH2, and -NRaRa1, wherein Ra and Ra1 are as defined hereinbefore, o or when q is equal to 2, then two R5 together represent further a group -O-(CH2)q1-O- wherein ql represents an integer comprised from 1 to 3 inclusive