NITROPYRAZOLES .6. STRUCTURE OF N-NITROPYRAZOLES AND THEIR C-13, N-15, AND N-14 NMR-SPECTRA

The NMR spectra (C-13, N-15, and N-14) of N-nitropyrazoles containing nitro, methyl, and cyano groups in the pyrazole ring were investigated . C-13 NMR spectra were recorded under conditions of triple selective heteronuclear resonance C-13-{H-1, N-14}. The effect of substituents i n the pyrazole ring on the chemical shifts in the C-13 and N-15 NMR sp ectra is discussed. Coupling constants J(C-13, H-1) and J(N-15, H-1) o btained by the polarization transfer method [H-1] --> C-13 and [H-1] - -> N-15 (INEPT, SPT) were measured and completely assigned.