Indolino-spiro-oxazine photochromic compounds with five-membered rings, method for their preparation, photochromic compositions and articles containing such compounds

摘要

The new photochromic compounds of the invention have the formula of an indolino-spiro-oxazine comprising an indolinic part and an oxazine part, wherein said oxazine part comprises an unsaturated heterocycle with 5 links which comprises one or several atoms selected from nitrogen and sulphur.PPPreferably the heterocycle is orthocondensed with a benzenic ring of the oxazine part of the compound, and said heterocycle comprises an imine C═N-bond. The ozazine part may typically be comprised of a benzothiazol-oxazine group of of an indolino- oxazine group.