Acta Cryst. (2004). E60, o1006-o1008  [ doi:10.1107/S1600536804011110 ]

(4-Oxo-1,4-dihydropyridin-1-yl)acetic acid

S. Gao, Z.-Y. Zhang, L.-H. Huo, J.-G. Zhao, S. M. Zain and S. W. Ng

Abstract: The title compound, expected to be a betaine, 4-hydroxypyridinioacetate, HOC₅H₄N⁺CH₂CO₂^- or C₇H₇NO₃, on the basis of its synthesis by the nucleophilic displacement of chloride from the chloroacetate ion in water, exists as (4-oxo-1,4-dihydropyridin-1-yl)acetic acid. The acid H atom interacts with the oxo O atom of an adjacent molecule to form a linear helical chain [OO = 2.451 (3) Å].

Online 15 May 2004

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