CAS Registry Number: 95-01-2
CAS Name: 2,4-Dihydroxybenzaldehyde
Additional Names: 2,4-dihydroxybenzenecarbonal
Molecular Formula: C7H6O3
Molecular Weight: 138.12
Percent Composition: C 60.87%, H 4.38%, O 34.75%
Literature References: Prepd by saturating with HCl a soln of resorcinol and anhydr hydrocyanic acid in abs ether and boiling the precipitated resorcylaldimide-HCl with water: Gattermann, Köbner, Ber. 32, 278 (1899); DE 106508; Chem. Zentralbl. 1900, I, 742. By adding POCl3 to a soln of resorcinol and formanilide in ether, then boiling with dil NaOH, acidifying with H2SO4 and extracting with ether: Dimrath, Zöppritz, Ber. 35, 995 (1902); by passing HCl into a mixture of resorcinol, ether, anhydr zinc chloride and cyanogen bromide, then boiling the precipitate with water: Karrer, Helv. Chim. Acta 2, 92 (1919).
Properties: Needles from water or ether + ligroin. mp 135-136°. bp22 226°. Freely sol in water, alcohol, ether, chloroform, glacial acetic acid. Difficultly sol in cold benzene. b-Resorcylaldehyde is easily dec by acids and alkalies. Prolonged exposure to moist air converts it to a brown, amorphous powder which is insol in ether.
Melting point: mp 135-136°
Boiling point: bp22 226°