1H, 13C and 15N NMR assignments of phena
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Eleuterio Burgueรฑo-Tapia; Yolanda Mora-Pรฉrez; Martha S. Morales-Rรญos; Pedro Jose
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Article
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2004
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John Wiley and Sons
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English
โ 120 KB
## Abstract Phenazopyridine hydrochloride (**1**), a drug in clinical use for many decades, and some derivatives were studied by oneโ and twoโdimensional ^1^H, ^13^C and ^15^N NMR methodology. The assignments, combined with DFT calculations, reveal that the preferred protonation site of the drug is