1,2-Benzopyran
Title: 1,2-Benzopyran
CAS Registry Number: 254-04-6
CAS Name: 2H-1-Benzopyran
Additional Names: a-5:6-benzopyran; 1,2-chromene; 3-chromene
Molecular Formula: C9H8O
Molecular Weight: 132.16
Percent Composition: C 81.79%, H 6.10%, O 12.11%
Literature References: Prepn from cis-o-hydroxycinnamyl alcohol: Chatterjea, J. Indian Chem. Soc. 36, 76 (1959), C.A. 54, 519b (1960); from phenyl propargyl ether in diethylphenylamine: Iwai, Ide, Chem. Pharm. Bull. 11, 1042 (1963); Iwai, Iwade, JP 63 22587 (1963 to Sankyo), C.A. 60, 2901e (1964). Earlier prepns: Maitte, Ann. Chim. (Paris) 9, 431 (1954); Normant, Maitte, Compt. Rend. 234, 1787 (1952).
Properties: Liquid; bp102 132°, bp15 92-92.5°, bp13 91°, bp9 77°. d16 1.0993. nD24 1.5869; nD16 1.5923 (Maitte); also reported as nD 1.5837 (JP 63 22587).
Boiling point: bp102 132°; bp15 92-92.5°; bp13 91°; bp9 77°
Index of refraction: nD24 1.5869; nD16 1.5923 (Maitte); nD 1.5837 (JP 63 22587)
Density: d16 1.0993

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