Title: Pyrazinoic Acid
CAS Registry Number: 98-97-5
CAS Name: Pyrazinecarboxylic acid
Additional Names: pyrazinemonocarboxylic acid
Molecular Formula: C5H4N2O2
Molecular Weight: 124.10
Percent Composition: C 48.39%, H 3.25%, N 22.57%, O 25.78%
Literature References: Prepn by thermal decompn of 2,3-pyrazinedicarboxylic acid: Hall, Spoerri, J. Am. Chem. Soc. 62, 664 (1940); by oxidation of alkylpyrazines: Gainer, J. Org. Chem. 24, 691 (1959).
Properties: Fine white needles from water, dec 225-229°. Sublimes. pK (25°) 2.92. Slightly sol in cold water, more sol in hot water. One gram dissolves in 120 g abs ethanol at 25°. Practically insol in ether, chloroform, benzene.
pKa: pK (25°) 2.92
Derivative Type: Methyl ester
Properties: Crystals from ether, mp 59°.
Melting point: mp 59°
Derivative Type: Amide see Pyrazinamide
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