benzo -, naphtho and phenanthrochromene substituted with a arylamine group with photochromen properties

摘要

P the invention relates to novel compounds of the type benzo, naphtho or phénantrochromènes which correspond to the formula (i) given above - after: these compounds (i) have useful properties photochromiques.l' invention also relates to their preparation, their applications as well as the photochromic compositions comprising them. / p