2-Furoic Acid
Title: 2-Furoic Acid
CAS Registry Number: 88-14-2
CAS Name: 2-Furancarboxylic acid
Additional Names: a-furoic acid; pyromucic acid; Brenzschleimsäure (German)
Molecular Formula: C5H4O3
Molecular Weight: 112.08
Percent Composition: C 53.58%, H 3.60%, O 42.82%
Literature References: Prepd from furfural by a Cannizzaro reaction: Wilson, Org. Synth. coll. vol. I (2nd ed., 1941) p 276; cf. US 2041184 (to Quaker Oats), C.A. 30, 4515 (1936); Wojcik, Ind. Eng. Chem. 40, 210 (1948); Harrisson, Moyle, Org. Synth. coll. vol. IV, 493 (1963). Formed in man and several animal species as a metabolite of furfural and related compds.
Properties: Elongated monoclinic prisms from water or by sublimation at 130-140° and 50-60 mm pressure. mp 133-134°. bp760 230-232°; bp20 141-144°. pK (25°) 3.12. Absorption spectrum: Hartley, Dobbie, J. Chem. Soc. 73, 600 (1898). One gram dissolves in 26 ml water at 15°; in 4 ml boiling water. More sol in alcohol; freely sol in ether.
Melting point: mp 133-134°
Boiling point: bp760 230-232°; bp20 141-144°
pKa: pK (25°) 3.12
Derivative Type: Ethyl ester
Additional Names: Ethyl furoate; ethyl pyromucate
Molecular Formula: C7H8O3
Molecular Weight: 140.14
Percent Composition: C 59.99%, H 5.75%, O 34.25%
Properties: Colorless crystals. d420 1.117. mp 34-36°. bp706 195°. Insol in water; sol in alcohol.
Melting point: mp 34-36°
Boiling point: bp706 195°
Density: d420 1.117
Derivative Type: Methyl ester
Additional Names: Methyl furoate; methyl pyromucate
Molecular Formula: C6H6O3
Molecular Weight: 126.11
Percent Composition: C 57.14%, H 4.80%, O 38.06%
Properties: Liquid. Agreeable odor. bp 181.3°; d421 1.1786; nD21 1.4871. Slightly sol in water; sol in alcohol.
Boiling point: bp 181.3°
Index of refraction: nD21 1.4871
Density: d421 1.1786

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