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Oxidative carbonylation of amines is an important low-waste process in the synthesis of ureas, intermediate products for obtaining pesticides, drugs, etc. It is also the basis for an important no-waste industrial process: the synthesis of urethanes by carbonylation of nitro compounds and amines. However, despite their important practical significance, the properties of carbonylation of amines and reduction of nitro compounds have been inadequately investigated. In the present work the authors investigated properties of the reaction of primary monoalkylamines with monoitrobenzenes and carbon monoxide, affording N,N`-substituted symmetric dialkylureas and anilines. 11 refs., 11 figs., 2 tabs.

The intramolecular H-bond strength in cis-enolic forms of β-diketones was investigated. The correlations between the 1 H hydroxyl proton shieldings and the chemical shifts of the 13 C and 17 O nuclei involved in the chelate ring, and the H/D isotope shifts on the latter resonances, were determined. An increase in the hydrogen bond strength leads to increasing values of H/D isotopic shifts on the 17 O resonances. The results obtained are compared with quantum chemical calculations and x-ray measurements