2817. Daphnetin

Nomenclature

CAS number: 486-35-1
7,8-Dihydroxy-2H-1-benzopyran-2-one; 7,8-dihydroxycoumarin.
C9H6O4; mol wt 178.14.
C 60.68%, H 3.39%, O 35.93%.

Description and 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, K"obner, Ber. 32, 287 (1899); Baker, Savage, J. Chem. Soc. 1938, 1602; Sp"ath, Galinovsky, Ber. 70B, 235 (1937); Sethna, Shah, Chem. Rev. 36, 1 (1945).

Chemical structure

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.