Spiro (dihydro indole) oxazine photochromic compounds

• Main Authors: S. D. MARSDEN, M. RICKWOOD
• Format: Patent
• Language: English
• Published: 10.11.1999
• Edition: 6
• Subjects: ADHESIVES; AUXILIARY PROCESSES IN PHOTOGRAPHY; CHEMISTRY; CINEMATOGRAPHY; DYES; ELECTROGRAPHY; HETEROCYCLIC COMPOUNDS; HOLOGRAPHY; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC CHEMISTRY; PAINTS; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES; PHOTOGRAPHY; PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHYSICS; POLISHES

A spiro (indolino) oxazine compound of general formula (I) (I) wherein R1 represents a group of the formula -NR2R3 wherein each of R2 and R3, which may be the same or different, independently represents an alkyl group, or a carbocyclic group, preferably aryl, or a heterocyclic group, or R2 and R3 taken together with the nitrogen atom to which they are attached represent a heterocyclic ring having one or more heteroatoms and which may optionally carry at least one substituent selected from alkyl, aryl or heteroaryl groups; -X- is selected from -O-, -S-, -Se-, -NH- or -NR- wherein R represents an alkyl group, and ring A is a carbocyclic or heterocyclic ring which can be optionally substituted with a group of formula R8 as defined above, or may optionally have a carbocyclic or heterocyclic ring fused thereto; and wherein R4-R8 are as defined in the specification. The spiro (indolino) oxazine compounds of the invention are useful as photochromic materials.