Protocatechualdehyde
Title: Protocatechualdehyde
CAS Registry Number: 139-85-5
CAS Name: 3,4-Dihydroxybenzaldehyde
Additional Names: 3,4-dihydroxybenzenecarbonal; protocatechuic aldehyde; rancinamycin IV
Molecular Formula: C7H6O3
Molecular Weight: 138.12
Percent Composition: C 60.87%, H 4.38%, O 34.75%
Literature References: Prepn from catechol: Reimer, Tiemann, Ber. 9, 1268 (1876); Tiemann, Koppe, ibid. 14, 2015 (1881); from vanillin: Tiemann, Haarmann, ibid. 7, 620 (1874); from veratric aldehyde: Dreyfus, DE 193958; Frdl. 9, 161 (1908-10); from piperonal: Hoering, Baum, Ber. 41, 1914 (1908); Barger, J. Chem. Soc. 93, 563 (1908); Buck, Zimmerman, Org. Synth. coll. vol. II, 549 (1943).
Properties: Platelets from water or toluene. Dimorphic. Dec 153-154°. pK (25°) 7.55. Soly in water (g/100 ml): 5 (20°); 33 (99°); in ethanol: 79 (78°). Freely sol in ether.
pKa: pK (25°) 7.55

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