1. The reaction of 1,3 dipolar cycloaddition of C-benzoyl-N-phenylnitrone to dimethyl vinylphosphonate at 20° gave isomeric trans-2-phenyl-3-benzoyl-4-dimethylphosphono- and trans-2-phenyl-3-benzoyl-5-dimethylphosphonoix ...
1. The 1,3-dipolar cycloaddition of C,N-diphenyl- and C-benzoyl-N-phenylnitrones to diethyl β,β-diacetylvinylphosphonate yields trans-2,3-diphenyl-4-diethoxyphosphono-5-5-diacetylisoxazolidine and trans-2-phenyl-3-benzoy ...
1. The reaction of 2-R-5-methyl-1,2,3-diazaphospholeswith diphenyldtazomethane leads to the formation of 2-R-4-methyl-6,6-diphenyl-1-phospha-2,3-diazabicyclo[3.1.0]hex-3-enes which, upon heating with alcohols and reaction ...
The stereochemistry of 2-furyl-substituted 1,3-dioxolanes was studied. The ethane fragment of 2-monosubstituted dioxolanes displays the spectrum that is typical for an AA'BB' spin system, while the spectra of the ...
Twenty-six previously unreported 5-alkoxymethyl-2,5-dialkyl-1,3-dioxanes have been synthesized by the condensation of 2-alkoxymethyl-2-alkylpropane-1,3-diols with aldehydes. It has been shown by an analysis of the PMR ...
Six 2, 2, 5-trialkyl-5-α-alkoxyethyl-1, 3-dioxanes have been synthesized for the first time by the condensation of 2-alkyl-2-α-alkoxyethyl-1, 3-propane diols with ketones, and it has been shown by a study of their PMR ...
The reduction of alkoxymethylalkylmalonic esters with lithium aluminum hydride has given previously unknown 2-alkyl-2-alkoxymethyl-1, 3-propanediols, and by the condensation of these with ketones six previously unreported ...
Using PMR spectra and GL chromatograms, it is shown that 2,5-di methyl-, 2-isopropyl-5-ethyl-, 2, 5-diisopropyl-5-α-isopropoxyethyl-1, 3-dioxane are mixtures of isomers. Efficient columns are used to fractionate these ...
A review of the dependences of the direct, geminal, vicinal, and long-range spin-spin coupling constants on the valence, dihedral, and torsion angles, and on the electronegativities and orientations of the heteroatoms is ...
The results of determinations of the configurations and conformations of heterorings containing N, O, Si, P, S, Ge, As, Sn, Se, Sb, and Te atoms by 1H, 13C, 15N, 19F, and 13P NMR spectroscopy are correlated. Publications ...
It has been shown that the using of the gauge-invariant atomic orbitals together with Gaussian expansion of orbitals allows one to obtain satisfactory results for the proton magnetic shielding constants without an average ...
A circuit for setting and regulating specimen temperature in NMR spectrometers based on a full-wave rectifier and a thermocouple sensor is described. Temperature fluctuations do not exceed 0. 2 degree K in the range of ...
1. Analysis of1H NMR spectra has shown that the thiooxide obtained from the α-oxide of Δ3-carene has the two three-membered rings in the cis-configuration, while the thiooxide obtained from the β-oxide is a trans-isomer. ...
1. It has been shown for the first time by means of1H NMR that in solutions of cyclic compounds of trivalent antimony, dimeric structures with the participation, of endocyclic and exocyclic O atoms are realized. The molecular ...
1. A mechanism has been proposed for intramolecular and intermolecular ligand exchange in a series of pentacoordinated derivatives of Sb. 2. An interpretation has been given for the temperature dependence of the NMR spectra ...
Diagrams of isoshielding lines in the vicinity of lone pairs of nitrogen and phosphorus atoms, as well as a C-N bond, have been calculated. The magnetic shielding constants of the protons were calculated by the gauge-invariant ...
1. By means of NMR, experimental data have been obtained on the dependence of conformational equilibrium parameters on the type of solvent. 2. The corrections arising as a consequence of the temperature dependence of the ...
1. The PMR spectra, dipole moments and molar Kerr constants of Δ4-carene and its oxide were studied. 2. A trans-structure of Δ4-carene oxide was confirmed, and the conformations of the molecules of the investigated compounds ...
Samitov Y.; Glushko L.; Malinovskii M.; Pokhodenko N.(1974)
The reaction of esters of 4,5-epoxy-2-hexenoic acid with ketones in the presence of acid catalysts gives 2,2,4-trialkyl-5-(2-carboalkoxyvinyl)-1,3-dioxolanes, the hydrogenation of which gives the corresponding saturated ...