S. N. Ignat'eva

Position of the equilibrium of stereoisomers in 5-chloro-2,4,6-triisopropyl-1,3,5-dioxaphosphorinane and its derivatives

ConclusionsIn equilibrated 5-chloro-2,4,6-triisopropyl-1,3,5-dioxaphosphorinane and its oxide and sulfide, the stereoisomer with an axially oriented P-Cl bond predominates.

Spin-spin coupling of77Se and31P nuclei in cyclic organophosphorous compounds

We have established that direct phosphorus-selenium spin-spin coupling constants in cyclic compounds with P=Se exocyclic and P-C endocyclic bonds are found in the range1JPSe=−708 to −859 Hz; in this case, it is greater for the axial orientation of P=Se than for the equatorial orientation.

The reaction of C-(N,N-dialkylamino)phosphaalkenes and their dimers with sulfur

The nature of the dialkylamino group has a significant effect on the reactivity of C-(N,N-di-alkylamino)phosphaalkenes upon their reaction with sulfur.

Reaction of α-Boryloxyalkyl- and α-hydroxyalkylphosphines and their derivatives with bases

ConclusionsThe course of the reaction of α-boryloxyalkyl- and α-hydroxyalkylphenylphosphines with pyridine depends on the substituents at carbon and boron. The oxides, sulfides, and selenides of α-boryloxyalkyl- and α-hydroxyalkylphenylphosphines react with pyridine to give salt products.

Substitution of the chr-O fragment in 1,3,2,5-dioxaboraphosphorinanes

Conclusions1,3,2,5-Dioxaboraphosphorinanes react with aldehydes having electron-withdrawing groups to form the corresponding 4,6-disubstituted dioxaboraphosphorinanes.

Synthesis and1H and31P NMR spectral characteristics of 2-substituted and 2,2-disubstituted 5-phenyl-5-thio-1,3,5-dioxaphosphorinanes

ConclusionsTreatment of phenylbis(hydroxymethyl)phosphine sulfide with acetals and ketals gives the corresponding 2-substituted and 2,2-disubstituted 5-phenyl-5-thio-1,3,5-dioxaphosphorinanes in which the P-Phenyl substituent occupies an axial position.

Synthesis and equilibrium of stereoisomers of 5-phenyl-5-thio(seleno)-2-phenyl(ethoxy)-1,3, 5-dioxaphosphorinanes

ConclusionsIndividual stereoisomers of 2,5-diphenyl-5-thio-1,3,5-dioxaphosphorinane, 5-phenyl-5-thio-2-ethoxy-1,3,5-dioxaphosphorinane, and 5-phenyl-5-seleno-2-ethoxy-1,3,5-dioxaphosphorinane, having the chair conformation with the axial orientation of the phenyl group on the phosphorus atom and the equatorial and axial orientation of the substituent in the 2-position, have been isolated.

Synthesis of cyclic boryloxyalkylphosphines with electron-acceptor substituents

ConclusionsThe reaction of hydroxyalkylphosphines containing electron-acceptor substituents with esters and anhydrides of boric acids and boric acid itself results in the formation of substituted 1,3-dioxa-5-phospha-2-boran-2-yl oxides.

Tautomerism in 1-phenyl-3-carbomethoxyphosphorinan-4-one and its derivatives

The possibility is discussed of using tautomerism to determine the conformational free energies of ring substituents, and the free energy of steric interaction of the substituents in the individual stereoisomers of 1-phenyl-3-carbomethoxyphosphorinan-4-one and its derivatives.

Influence of the solvent on the equilibrium of 4-carbomethoxy-1, 3-dithiacyclohexanones-5

1. The position of equilibrium of 4-carbomethoxy-1, 3-dithiacyclohexanone-5 (I), 2-methyl-4-carbomethoxy-1,3-dithiacyclohexanone-5 (II), and 2, 2-dimethyl-4-carbomethoxy-1, 3-dithiacyclohexane-5 (III) in acetonitrile, 50% aqueous dioxane, methanol, ethanol (fractional distillate), abs. ethanol, isobutanol, dioxane, and heptane was determined. 2. The ratio of the equilibrium constants of (I) and (II) does not depend on the nature of the solvent.