Syntheses of Oxazoles and Oxadiazoles and their Fluorescence Spectra

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  • オキサゾールおよびオキサジアゾール類の合成とケイ光性について
  • オキサゾール オヨビ オキサジアゾールルイ ノ ゴウセイ ト ケイコウセイ ニ ツイテ

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Through dehydration of ω-acylaminoacetophenone with the aid of sulfuric acid and that of diacylhydrazine with the aid of phosphorus oxychloride, oxazoles and oxadiazoles were obtained as follows : 1, 2-bis-(5'-phenyloxazol-2'-yl)ethylene, (1), mp 267268°C, 2-(p-X-styryl)-5-phenyloxazole, X=H, (2), mp 102103°C, X=Cl, (3) mp 148450°C, X=COOCH3, (4), mp 151152.5°C, and oxadiazoles, 1, 2-his-(5'-phenyl-1', 3', 4'-oxadiazol-2'-yl)ethylene, (5), mp 307309°C, 2, 5-bis-(p-X-styryl)oxadiazole (1, 3, 4), X=H, (6), mp 153.8-154.5°C, X=Cl, (7), mp 230232°C, X=COOCH3, (8), mp 264265°C, 2-(4-carbomethoxystyryl)-5-phenyloxadiazole(1, 3, 4), (9), mp 154155°C. <BR>Their maximum absorption wave lengths and the relative strengths of fluorescence bands in dioxane were also determined as follows : (1), 445mμ (100), (2), 408 mμ (68), (3), 415 mμ (90), (4), 435 mμ (111), (5), 385 mμ (40) 450 mμ (36), (6), 400 mμ (32) 432 mμ (26), (7), 410 mμ (48) 430 mμ (51), (8), 415 mμ (82) 437 mμ (69), (9), 385 mμ (16.2).

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