S. A. Pogozhikh

Structure of the Adduct of N-(α-Phenylethyl)acetamide with HCl in the Liquid, Solid, and Gas Phases

The structure of the adduct of N-(α-phenylethyl)acetamide with HCl in the liquid and solid phases was examined by elemental analysis, 1H and 13C NMR spectroscopy, and X-ray diffraction to show that the positive charge is localized on the nitrogen atom. The electronic structure of the adduct in the gas phase was studied by means of ab initio calculations at the 6-31G** level of theory. In the latter case, the positive charge is delocalized over the acetamide fragment of the molecule.

Synthesis and some chemical properties of 4-acyl-2,6-disilapiperazines. Molecular and crystal structure of 4-formyl-2,2,6,6-tetramethyl-2,6-disilapiperazine

An one-pot synthesis of 4-acyl-2,6-disilapiperazines has been developed which consists of treatment of carboxamides with hexamethyldisilazane and dimethylchloromethylchlorosilane mixture with subsequent amination of the intermediate N,N-bis(dimethylchlorosilylmethyl)amides (which are derivatives of pentacoordinated silicon) with ammonia or primary amines. The hydrolytic stability of the 4-acyl-2,6-disilapiperazines and their reactions with benzenesulfonamide have been studied. The structure of 4-formyl-2,2,6,6-tetramethyl-2,6-disilapiperazine has been confirmed by X-ray diffraction analysis.