CAS Registry Number: 486-35-1
CAS Name: 7,8-Dihydroxy-2H-1-benzopyran-2-one
Additional Names: 7,8-dihydroxycoumarin
Molecular Formula: C9H6O4
Molecular Weight: 178.14
Percent Composition: C 60.68%, H 3.39%, O 35.93%
Literature References: The aglucon of daphnin. By boiling daphnin with dil mineral acids; by enzymatic hydrolysis of daphnin; by sublimation from daphnin; by synthesis: v. Pechmann, Ber. 17, 934 (1884); Gatterman, Köbner, Ber. 32, 287 (1899); Baker, Savage, J. Chem. Soc. 1938, 1602; Späth, Galinovsky, Ber. 70B, 235 (1937); Sethna, Shah, Chem. Rev. 36, 1 (1945).
Properties: Crystals from dil alc, mp 256° (dec). Sublimes. Sol in boiling water, hot dil alcohol, hot glacial acetic acid; very sparingly sol in ether, in carbon bisulfide, in chloroform, in benzene. Sol in alkali and alkali carbonate solns giving a yellow color. Aq solns give a green color with ferric chloride which turns red on addition of sodium carbonate.
Melting point: mp 256° (dec)