H-1-NMR SPECTRA OF SOME NITRO-DERIVATIVES OF 2-ALKYLAMINO-4-METHYLPYRIDINES, 2-PHENYLAMINO-4-METHYLPYRIDINES, 2-PIPERIDYL-4-METHYLPYRIDINES, 2-MORPHOLYL-4-METHYLPYRIDINES, 2-(N-ALKYL-N-NITROSOAMINO)-4-METHYLPYRIDINES AND 2-ALKYLNITRAMINO-4-METHYLPYRIDINES OR 6-METHYLPYRIDINES

H-1 NMR spectra of some N-substituted 2-amino-3-nitro- and 2-amino-5-n itropyridines were measured and interpreted. Chemical shift assignment s were based on existing chemical shift rules for substituted pyridine s and spectral comparison with compounds of similar structure. The spl itting of the methyl group signal of the methylamino group into a doub let testifies that the investigated compounds exist in the amino Form. Some ortho-amino- and ortho-alkylaminonitropicolines were found to gi ve splitting of the amino signals due to intramolecular hydrogen bondi ng acid steric hindrance.