✍ Scribed by S. L. Ioffe; A. V. Kalinin; B. N. Khasapov; A. U. Stepanyants; V. A. Tartakovskii
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## Abstract Phenazopyridine hydrochloride (**1**), a drug in clinical use for many decades, and some derivatives were studied by one‐ and two‐dimensional ^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
## REFERENCE DATA carbons, for various substituent groups and positions were carried out by gated decoupling with NOE. ## RESULTS AND DISCUSSION The I3C NMR chemical shifts of the compounds are shown in Tables 123; 'J(CH) and long-range coupling constants of 2, 9, 13 and 18, measured by gated d
## Abstract NMR spectroscopic studies are undertaken with derivatives of 2‐pyrazinecarboxylic acid. Complete and unambiguous assignment of chemical shifts (^1^H, ^13^C, ^15^N) and coupling constants (^1^H,^1^H; ^13^C,^1^H; ^15^N,^1^H) is achieved by combined application of various 1D and 2D NMR spe
## Abstract ^1^H, ^13^C, and ^15^N NMR chemical shifts for pyridazines 4–22 were measured using 1D and 2D NMR spectroscopic methods including ^1^H^1^H gDQCOSY, ^1^H^13^C gHMQC, ^1^H^13^C gHMBC, and ^1^H^15^N CIGAR–HMBC experiments. Copyright © 2010 John Wiley & Sons, Ltd.
## Abstract ^1^H NMR assignment, including the values of δ~H~ and __J__(H,H) for the cyclopropane moiety, and ^13^C NMR and ^15^N NMR spectral data for ciprofloxacin are presented. Copyright © 2004 John Wiley & Sons, Ltd.