The NMR ¹H-spectrums of a series of organic compounds containing atoms  of sulfur, nitrogen and oxygen in their composition have been studied. There have been calculated correlation data connecting electronic density of heteroatoms with contribution into a value of  electronegativites, which will considerably increase on the account of p-electrons. It is shown that chemical shifts of methylene protons cannot be described by independent local contributions and they are determined mainly by  electronegativity of he-te­roatom.