Reaction of selenium dichloride with trimethylpropargylsilane

Russian Chemical Bulletin -     

Reaction of selenium dichloride with divinyl telluride

Russian Journal of Organic Chemistry -     

Reaction of isosteviol diterpenoid with selenium dioxide

Diterpenoid isosteviol was oxidized by selenium dioxide in acetic anhydride or in a mixture of acetic anhydride with dioxane to 15-oxo-derivative, whereas reaction with SeO₂ in boiling ethanol led to a mixture of mono- and diselenides. Molecular structure of the monoselenide is established by the X-ray structural analysis.     

Reaction of selenium dibromide with divinyl sulfide

Russian Journal of General Chemistry -     

Mechanism of the cyclization of dimethyl diethynyl silane with selenium tetrabromide: Computational and structural studies, and monitoring

The structure of 2,4-dibromo-2-dibromomethyl-3,3-dimethyl-1-selena-3-silacyclopentene-4, formed by regioselective electrophilic addition of SeBr₄ to dimethyl diethynyl silane, has been determined using X-ray analysis technique. Quantum chemistry methods were used to study elementary stages of the reaction. It was found that the first stage consisted of SeBr₄ conversion into bimolecular complex Br₂?SeBr₂, initiated by dimethyl diethynyl silane. Possible formation of five-membered and six-membered heterocycles involves different cyclization mechanisms. The formation of only five-membered heterocycle is explained by kinetically preferable ring closure through four-center transition state. The conclusions obtained by calculations were confirmed by monitoring of the reaction using ¹H NMR method.     

Methoxytelluration of styrene with tellurium tetrabromide

Russian Journal of Organic Chemistry - Treating styrene with tellurium tetrabromide led to the formation of tribromo[(2-methoxy-2-phenyl)-ethyl]-λ4-tellane which was reduced with sodium...     

Investigation of ethynylpyridines using the electron propagator theory

The optimized geometry, dipole moment, and HOMO–LUMO gap for three monoethynylpyridines and six diethynylpyridines have been computed using DFT/B3LYP/6‐311++g(3df,3p) level of theory, and the first 11 vertical ionization energies and electron affinity of these compounds have been calculated using various electron propagator decouplings. The outer valence Green's function approximant of the electron propagator theory offers closest agreement with experimental photoelectron spectrum, and the results for structural suitability, dipole moment, HOMO–LUMO gap, ionization energies, and electron affinity indicate that 2‐ethynylpyridine among monoethynylpyridines and 2,6‐diethynylpyridine among diethynylpyridines may be useful precursors for the preparation of conducting polymers. © 2011 Wiley Periodicals, Inc. Int J Quantum Chem 112:426–439, 2012     

Reaction of α-polynitroalkyl derivatives of sulfur and selenium with hydrogen halides and halide ions

Hydrogen halides (HCl and HF) react with -polynitroalkylsulfides and -polynitroalkylselenides as electrophilic or as nucleophilic reagents depending on the conditons, forming accordingly products of electrophilic or nucleophilic substitution at the -carbon atom. In contrast to this, halogen ions (Cl^–, F^–) always bond to the -carbon. The use of dipolar aprotic solvents and activators (Lewis acids or strong mineral acids) facilitates the formation of products of nucleophilic substitution at the -carbon.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2106–2111, September, 1989.