Претраживање
Приказ резултата 1-10 од 17
Cation-pi interaction with transition-metal complex as cation
(Elsevier Science Bv, Amsterdam, 1999)
A novel type of cation-pi interaction, where a transition-metal complex cation interacts with a pi-system, is predicted here. The theoretical calculations on the [Co(NH3)(6)](3+)-C6H6 system presented demonstrate that a ...
Sequential radical addition/cyclization/β-elimination reactions. 3-exo- and 5-exo-cycloaddition reactions of 5-phenylthio-3-pentenyl and 5-phenylthio-3-pentynyl radicals
(Tetrahedron, 1992)
Sequential radical addition/5-exo-cyclization/β-elimination reactions, accomplished by thermally or photolytically induced decompositions of O-acyl derivatives of N-hydroxypyridine-2-thione or other thiohydroxamic esters ...
Influence of depyritization on NMR relaxation parameters of Aleksinac oil shale kerogen
(Elsevier Sci Ltd, Oxford, 1998)
Parallel proton and cross-polarization/magic-angle spinning (CP/MAS) nuclear magnetic resonance (NMR) relaxation measurements are reported on Aleksinac oil shale kerogen concentrate and pyrite-free kerogen concentrate. ...
Sesquiterpene lactones from Centaurea species: C-derventana and C-kosaninii
(Georg Thieme Verlag, Stuttgart, 1998)
Theoretical studies of inorganic and organometallic reaction mechanisms. 14. beta-hydrogen transfer and alkene/alkyne insertion at a cationic iridium center
(Amer Chemical Soc, Washington, 1998)
Recent experimental work shows that alkanes can be activated by Cp*Ir(PMe3)(CH3)(+) at room temperature to generate olefin complexes. The reaction begins with alkane activation by oxidative addition (OA) followed by reductive ...
Prediction of the reactive intermediates in alkane activation by tris(pyrazolyl borate)rhodium carbonyl
(Amer Chemical Soc, Washington, 1998)
Two intermediates are observed in the time-resolved IR spectra of the photoinitiated alkane (RH) activation reaction of Tp*Rh(CO)(2) (Tp* = HB-(3,5-dimethylpyrazolyl). Density functional calculations suggest that the first ...
Sequential free radical reactions with xanthates: Cyclopentane ring annulation
(Georg Thieme Verlag, Stuttgart, 1998)
In the presence of electron-rich alkenes, electro- and ambiphilic homoallylic radicals, generated by homolytic decomposition of the corresponding xanthates, undergo annulation with inverse electron-demand, and afford ...
Investigation of catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale organic matter
(Organic Geochemistry, 1992)
The catalytic effect of indigenous minerals in the pyrolysis of Aleksinac (Yugoslavia) oil shale was studied in this paper. The substrates were prepared by gradual removal of the mineral constituents (carbonates, silicates, ...
Evaluation of the effects of native minerals on the organic matter of Aleksinac oil shale based on the composition of free and bound bitumens
(Organic Geochemistry, 1992)
In order to evaluate the adsorption and catalytic effects of indigenous carbonates and silicates on the organic matter of Aleksinac oil shale, the free and the bound bitumens were isolated and analyzed by organic geochemical ...
Electrogeneration, behaviour and applications of cobalt(III) in perchlorate solutions in acetic acid
(Elsevier, 1992)
Conditions for the electrochemical generation of cobalt(III) in acetic acid-perchlorate media were determined. The current efficiency depended on the current density at the working electrode and on the amounts of water or ...