新型杂配的有机镁(II)酰胺配合物的合成[IMesMg(Ar){N(SiMe 3)2 }];(IMes = 1,3-双(2,4,6-三甲基苯基)咪唑-2-亚烷基),Ar = 2,6-Me 2 C 6 H 3(Xyl)(1)和2,4,6-Me据报道3 C 6 H 2(Mes)(2)。化合物1和2均通过多核(1 H,13 C和29Si)磁共振波谱,元素分析和单晶X射线结构分析。此外,已经研究了有机硅烷与胺的有机镁酰胺预催化的交叉脱氢偶联。
Reactivity of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:mo stretchy="false">[</mml:mo><mml:msup><mml:mrow><mml:mtext>Tism</mml:mtext></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mtext>Pr</mml:mtext></mml:mrow><mml:mtext>i</mml:mtext></mml:msup><mml:mtext>Benz</mml:mtext></mml:mrow></mml:msup><mml:mo stretchy="false">]</mml:mo></mml:mrow></mml:math>MgMe towards secondary amines and terminal alkynes: Catalytic dehydrocoupling with hydrosilanes to afford Si–N and Si–C bonds
作者:Michael Rauch、Renee C. Roberts、Gerard Parkin
DOI:10.1016/j.ica.2019.03.015
日期:2019.8
The magnesium hydride and methyl compounds, [Tism(PriBenz)]MgX (X=H, Me), react with diphenylamine (Ph2NH) and pyrrolidine (C4H8NH) to afford the amide derivatives, [Tism(PriBenz)]MgNPh2 and [Tism(PriBenz)]MgNC4H8, while reactions with the terminal alkynes, PhC CH and (BuC)-C-n CH, afford the corresponding acetylide derivatives, [Tism(PriBenz)]MgC CPh and [Tism(PriBenz)]MgC CBun. The Mg-N bond of [Tism(PriBenz)]MgNR2 may be cleaved by hydrosilanes, such that [TismPriBenz]MgMe is an effective precatalyst for the dehydrocoupling of hydrosilanes and amines. For example, [Tism(PriBenz)]MgMe enables the conversion of a 1:1 mixture of Ph2SiH2 and C4H8NH at room temperature to the silazane, Ph2SiH(NC4H8).[Tism(PriBenz)]MgH and[Tism(PriBenz)]MgMe are also capable of dehydrocoupling PhC CH and PhSiH3 to form PhSiH2C CPh. In addition to dehydrocoupling of terminal alkynes, [Tism(PriBenz)]MgMe is also capable of achieving the isomerization 3-phenyl-1-propyne to phenylallene.
Tris(oxazolinyl)boratomagnesium-Catalyzed Cross-Dehydrocoupling of Organosilanes with Amines, Hydrazine, and Ammonia
作者:James F. Dunne、Steven R. Neal、Joshua Engelkemier、Arkady Ellern、Aaron D. Sadow
DOI:10.1021/ja207641b
日期:2011.10.26
We report magnesium-catalyzed cross-dehydrocoupling of Si-H and N-H bonds to give Si-N bonds and H-2. A number of silazanes are accessible using this method, as well as silylamines from NH3 and silylhydrazines from N2H4. Kinetic studies of the overall catalytic cycle and a stoichiometric Si-N bond-forming reaction suggest nucleophilic attack by a magnesium amide as the turnover-limiting step.