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F. K. Schmidt L. B. Belykh Myagmarsuren Gomboogiin Yu. Yu. Titova 《Kinetics and Catalysis》2010,51(2):235-243
The catalytic properties and formation mechanism of alkene dimerization-active complexes in systems based on Ni(PPh3)4 and boron trifluoride etherate are considered. The nature of the modifying action of Brønsted acids on the properties of metal complex catalysts for propylene dimerization is reported. The interaction between Ni(PPh3)4 and BF3 · OEt2 is influenced by water. Depending on the water concentration, the reaction can proceed via formally one-electron oxidation to yield cationic Ni(I) complexes or via two-electron oxidation to yield Ni(II) hydrides. The catalytically active species in alkene dimerization and oligomerization in these systems are Ni(II) hydrido complexes. 相似文献
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α,β-Unsaturated acetylenic γ-hydroxyketones have been shown to react with ethyl acetoacetate in a Michael-addition fashion and subsequently undergo cyclization followed by dehydration to give substituted furans with a predictable regiospecificity. The yields were good to excellent. A mechanism for the transformation is proposed, and this mechanism explains why furan formation does not take place when the same unsaturated ketones are treated with α-methylated acetoacetate and diethyl malonate. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications® for the following free supplemental resource: Full experimental and spectral details.] 相似文献
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V. S. Tkach D. S. Suslov G. Myagmarsuren F. K. Shmidt 《Russian Journal of Applied Chemistry》2007,80(8):1419-1423
Trimerization of ethylene was examined as a route to isohexenes [in particular, 3-methyl-2-pentene (cis + trans)] inaccessible by dimerization of propylene. 相似文献
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Gomboo Myagmarsuren Vitalii S. Tkach Dmitrii S. Suslov Fedor K. Shmidt 《Reaction Kinetics and Catalysis Letters》2005,85(1):197-203
Summary The insertion of the previously coordinated second molecule of propene into the Pd-C bond is the rate-determining step in the dimerization of propene with the Pd(acac)2 + BF3OEt2 catalyst system. Tetracoordinated square planar Pd hydrides bearing two vacant coordination sites are likely to be catalytically active species in the dimerization of propene. The simplicity of the catalyst system composition might be of industrial importance. 相似文献
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Gomboo Myagmarsuren Vitaly S. Tkach Dmitry S. Suslov Mikhail L. Chernyshev Fedor K. Shmidt 《Reaction Kinetics and Catalysis Letters》2007,90(1):137-143
Catalyst systems based on palaadium carboxylates and boron trifluoride etherate were examined in the dimerization of styrene,
telomerization of butadiene with diethylamine and homopolymerization of norbornene. The systems are shown to have higher efficiency
than their palladium β-diketonate prototypes at analogous conditions. 相似文献
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G. Myagmarsuren V. S. Tkach D. S. Suslov F. K. Shmidt 《Russian Journal of Applied Chemistry》2007,80(2):252-256
Catalytic systems based on palladium carboxylates and boron trifluoride etherate were studied in the reaction of additive polymerization of nonbornene. The system Pd(OAc)2 + 25BF3OEt2 exhibits a high activity, up to 154 100 kg of nonbornene per mole of Pd per hour. 相似文献
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Gomboo Myagmarsuren Vitalii S. Tkach Fedor K Shmidt 《Reaction Kinetics and Catalysis Letters》2004,83(2):337-343
The isomerization of 1-hexene over Pd(acac)2 + BF3OEt2 and Pd(acac)2 + PPh3 + BF3OEt2 catalyst systems proceeds by the consecutive-parallel scheme. Tetracoordinate square-planar Pd hydrides bearing two vacant
coordination sites are likely to be catalytically active species for the isomerization of hexene-1.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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