Photochromic fused pyrans substitued with phenyl carrying a carbamyl or urea group

摘要

Disclosed are novel benzo-, naphtho- and phenanthrochromenes substituted by carbamated or ureated phenyls having the following general formula (1): wherein R1 represents a group their preparation, photochromic compositions and articles containing them. This family of compounds have interesting and useful photochromic properties, especially in terms of absorption band and discoloration speed.