Proton magnetic resonance spectra and structure of the reaction products of anhydrides of α, β- unsaturated acids with nonsymmetrical dimethylhydrazine

Summary

• 1. The high-resolution PMR spectra of a number of new compounds, reaction products of anhydrides ofα, β-unsaturated acids with dimethylhydrazine, as well as the spectra of the alkiodides of these compounds, were obtained and deciphered.

• 2. The structures of the compounds studied were determined. According to the PMR data, the reactions result in the formation of 1,1-dimethylpyrazolinium-3-oxides or the mesomeric structures (VI), as well as the dimethylhydrazides ofα, β-unsaturated acids, which agrees with the data obtained chemically [4].

• 3. A substantial difference in the chemical shifts of the methyl groups on the nitrogen atom in neutral, bipolar, and positively charged molecules of the substances studied was detected.