PHOTOCHROMIC COMPOSITION CONTAINING POLYHALOGENATED HYDROCARBON,SPIROPYRAN COMPOUND AND POLY-N-VINYLCARBAZOLE AND THE USE THEREOF

1359472 Pyran derivatives AGFA-GEVAERT 2 Aug 1971 [1 Sept 1970] 41749/70 Heading C2C [Also in Division G2] 3 - Methyl - spiro - di - betanaphthopyran is prepared by refluxing 2 - hydroxy - 1 - naphthaldehyde and methyl ethyl ketone in a 2 : 1 molar ratio in acidic ethanol to produce the pyrilium sal...

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Bibliographische Detailangaben
Hauptverfasser:	VAN DEN HOUTE J,BE, LARIDON U,BE
Format:	Patent
Sprache:	eng
Schlagworte:	AUXILIARY PROCESSES IN PHOTOGRAPHY CHEMISTRY CINEMATOGRAPHY ELECTROGRAPHY HETEROCYCLIC COMPOUNDS HOLOGRAPHY METALLURGY ORGANIC CHEMISTRY PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES PHOTOGRAPHY PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES PHYSICS
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Zusammenfassung:	1359472 Pyran derivatives AGFA-GEVAERT 2 Aug 1971 [1 Sept 1970] 41749/70 Heading C2C [Also in Division G2] 3 - Methyl - spiro - di - betanaphthopyran is prepared by refluxing 2 - hydroxy - 1 - naphthaldehyde and methyl ethyl ketone in a 2 : 1 molar ratio in acidic ethanol to produce the pyrilium salt. The spiropyran is produced when the solution is made alkaline. 1,3,3-Trimethylindolinospirobenzopyran is prepared by refluxing equimolar quantities of salicaldehyde and 1,3,3-trimethyl-2-methyleneindolenine in ethanol.