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中国化学会第九届全国无机化学学术会议

作者： Gengwen Tan matthias driess Xinping Wang Department of Chemistry Nanjing University Department of Chemistry Technische Universitt Berlin

N-heterocyclic carbenes（NHCs） represent one of the most widely utilized supporting ligands in transition metal（TM） chemistry in the last decades.[1] These complexes have exhibited numerous superior activities in comparison to phosphine complexes owing to the stronger σ donor ability of NHC ligands.[2] Whereas, the heavy homologs of NHCs, the N-heterocyclic silylenes（NHSis） are emerging as a novel class of versatile steering ligands in the coordination chemistry of the transition metals, and their complexes have already shown remarkable features in small molecule activation and as precatalysts for various types of organic transformations.[3] Therefore, combining these two ligand types in one chelate molecule might enable new coordination features at TMs. Moreover, the presence of both strong σ-donating moieties might facilitate the coordination and dissociation of other ligands thereby improving the reactivity or catalytic performance of respective TM *** I present the unexpectedly facile formation of the first mixed NHSi-NHC chelate complex[L1Si:（CH2）（NHC）]NiBr2 2 [L1 = CH（Me C=NAr）2, Ar = 2,6-iP r2C6H3;NHC =3,4,5-trimethylimidazol-2-yliden-6-yl] through the hydrogen atom migration from the silicon atom to the exocyclic methylene group in L2Si（H）（CH2）NHC [L2 = CH（C=CH2）（CMe）（NAr）2, Ar = 2,6-iPr2C6H3;NHC =3,4,5-trimethylimidazol-2-yliden-6-yl] mediated by Ni Br2. The analogous reduction of 2 in the presence of1,2-bis（dimethylphosphino）ethane（DMPE） furnishes the first mixed NHSi-NHC（DMPE）Ni0 complex 3. Moreover,complex 2 shows a high catalytic activity for Kumada-Corriu-type cross-coupling reactions.[4]

关键词： silylene main group chemistry N-heterocyclic carbene homogeneous catalysis cross-coupling reaction

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Supported ZnO catalysts for the conversion of alkanes:About the metamorphosis of a heterogeneous catalyst

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Journal of Natural Gas Chemistry 2012年第5期21卷 581-594页

作者： S.Arndt B.Uysal A.Berthold T.Otrebma Y.Aksu M.driess R.Schomcker Technische Universitāt zu Berlin Institut fūr ChemieStraβe des 17 Juni 12410623 BerlinGermany Akdeniz University Department of Chemistry07058 AntalyaTurkey Technische Universitāt zu Berlin Institut fūr Werkstof fwissenschaftenHardenbergstr 4010623 BerlinGermany

ZnO could be a suitable catalyst for the oxidative conversion of CH4,C2H6 and ***,the main drawback is its thermal ***,ZnO supported on ZrO 2,TiO2,γ-Al2O and SiO2 was investigated for the oxidative dehydrogenation of propane and ethane,and the oxidative coupling of *** stability of the supported ZnO is partially improved,but ZnO reacts with the support material,forming new compounds （Zn-zirconates,-titanates,-aluminates and-silicates）,which already occurs below reaction *** might also be the case for many other heterogeneous catalysts.

关键词： oxidative dehydrogenation oxidative coupling of methane oxidative dehydrogenation of ethane oxidative dehydrogenation of propane ZnO

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