Preparation and spectral properties of products of the reaction of N,N-dimethylhydrazine with selected enolethers/alkoxymethylene systems

There were studied series of activated enolethers (alkoxymethylene derivatives of malonic or 3-oxobutanoic acids derivatives of general formula R-O-CH=C(R¹, R²) where R¹ = R²/ R¹ ≠ R² (R¹, R² = CO₂CH₃, CO₂CH₂CH₃, COCH₃, CN) with N,N-dimethylhydrazine. They smoothly provided products of nucleophilic vinylic substitution reaction - dimethyl hydrazinyl methylene derivatives of malonic or 3-oxobutanoic acids (enhydrazines), respectively from 20 minutes to 2 hours at room temperature.