[en] In this work the authors report the reaction of diacetyl with azadiphosphetidines, previously obtained by them, which contained alkoxy and amino groups on the phosphorus atom. It was found that 2,4-dialkoxy and 2,4-bisalkylamino- 1,2,4-azaphosphetidines react with one equivalent of diacetyl in methylene chloride at -78⁰C with the formation of the spirophosphoranes. The composition and structure of the spirophosphoranes were confirmed by elemental analysis and by ³¹P, ¹H and ¹³C NMR spectroscopy

[en] The alkylation, acylation, phosphorylation, and bromination of 2,4-dialkoxy-1,2,4-azadiphosphetidines go by the Arbuzov-reaction scheme with the formation of the corresponding 1,2,4-azadiphosphetidines containing one or two 4-coordinate phosphorus atoms in the molecule. The structures of the new 1,2,4-azadiphosphetidines obtained were investigated with the aid of the ¹H, ³¹P, and ¹³C NMR spectra, assignments were made for the signals of the cis and trans isomers of these compounds, and some of their geometric parameters were determined. The Arbuzov reactions of 2,4-dialkoxy-1,2,4-azadiphosphetidines with methyl iodide, bromine, and some acyl halides go with change in the proportions of the cis and trans isomers in the reaction products in comparison with the original azadiphosphetidines, which is the result of the change in the configuration of one of the phosphorus atoms in the ring

[en] The NMR method has been used to study the effect of sobstitute electronic properties in reagents on stereoisomerism in arylsulfenchlorides addition to β-deuterostyrenes under the conditions excluding mutual transformation of stereoisomers (kinetic control). Easy transformation of stereoisomers under the conditions usually used for carrying out electpophilic addition reactions is traced. Aryl sulfenchloris des addition to the sUbstituted Z- and epsilon-β - deuterostyrenes, irrespective of the type of the substitutes in the benzene ring of both reagents+ proceeds trans-stereospecifically

[en] The Michael addition of acrylonitrile to the pyrrolidine enamine of 1-(S-α-phenyl-ethyl)-4-piperidone proceeds with the formation of a 1:1 mixture of 1-(S-α-phenyl-ethyl)-3-(2-cyanoethyl)-4-piperidone diastereomers. A diastereomer isolated in pure form was shown by x-ray diffraction structural analysis to have S-configuration of the new chiral center at C/sub (3)/ of the piperidone ring