1102. 1,2-Benzopyran

Nomenclature

CAS number: 254-04-6
2H-1-Benzopyran; α-5:6-benzopyran; 1,2-chromene; 3-chromene.
C9H8O; mol wt 132.16.
C 81.79%, H 6.10%, O 12.11%.

Description and 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).

Chemical structure

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).