SCOPUS 정보 검색 플랫폼

Volumn 5, Issue 6, 2008, Pages 502-506

Novel photochromic spiro[thioxanthene-naphthopyrans] with faster bleaching kinetics

Author keywords

Heterocycles; Kinetics; Naphthopyran; Photochromism; Spiro compounds; UV irradiation

Indexed keywords

EID: 57349113146 PISSN: 15701786 EISSN: None Source Type: Journal
DOI: 10.2174/157017808785740417 Document Type: Article

Times cited : (3)

References (19)

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- Representative experimental procedure: a suspension of thioxanthone (1.00 g, 4.72 mmol, and lithium acetylide ethylene diamine complex (1.50 g, 14.7 mmol) in dry THF (50 ml) was stirred under an argon atmosphere for 24 h. The suspension was treated with water (100 ml) and the aqueous phase extracted with ethyl ether (3 × 100 ml, The organic phase was dried over anhydrous Na2SO4 and the solvent evaporated leaving the crude 9-hydroxy-9-ethynyl-9H-thioxanthene 4. A solution of 4, naphthol 1 (0.100g. 0.463 mmol) pyridinium p-toluenesulphonate (PPTS, 10 mg) in 1,2-dichloroethane (20 ml) was refluxed for 4 h under an argon atmosphere. Solvent evaporation gave a brown oil which was purified by silica gel column chromatography (3% ethyl acetate/hexane, Recrystallization from CHCl3/pentane gave a crystalline red compound 7 (0.043 g, Yield 21, IR (cm-1, 3456, 2944, 1730. 1H NMR δCDCl3, ppm
- 13C NMR 147.73, 138.71, 134.95, 129.15, 127.80, 127.50, 126.98, 126.75, 126.49, 126.09, 125.88, 124.61, 123.72, 121.82, 121.43, 121.39, 120.57, 113.24, 80.35.

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