Synthesis and Characterization of Neutral and Cationic Magnesium Complexes Supported by NHC Ligands
Synthesis and Characterization of Neutral and Cationic Magnesium Complexes Supported by NHC Ligands
复制标题
NHC 配体支持的中性和阳离子镁配合物的合成和表征
作者：
Jean‐Charles Bruyere;C. Gourlaouen;L. Karmazin;C. Bailly;C. Boudon;L. Ruhlmann;Pierre de Frémont;S. Dagorne
通过IMES(IMES=1，3-bis(2，4，6-trimethylphenyl)imidazol-2-ylidene))和IPR(IPR=1，3-bis(2，6-diisopropylphenyl)imidazol-2-ylidene))与格氏试剂反应，合成了一系列中性的N-杂环卡宾镁烷基配合物。在四氢呋喃存在下，分离得到了单核化合物[Mg(IMES)(R)(BR)(THF)](1，R=Me；2，R=Et)和[Mg(IPR)(R)(BR)(THF)](3，R=Me；4，R=Et)。进一步甲基化得到了镁四氢呋喃加合物[Mg(Ipr)(Me)2(Thf)](5)，它结晶为二聚体[{(mg(Ipr)(Me)}2(μ-Me)2](5‘)，从而证明了这些体系中四氢呋喃的稳定配位。相反，在Et2O存在下，分离和表征了双核镁(II)物种[{(Mg(Nhc)(Br)}2(μ-Me)2](6，nhc=ims；7，nhc=ipr)，[{(mg(Ims)(Ph)}2(μ-bR)2](8)，[{(mg(Ims)(CH2Ph)}2(μ-Cl)2](9)和[{(mg(Ipr)(Ph)}2(μ-bR)2](10))。质子化配体[IMES-H]Cl与乙基溴化镁发生质子解反应，生成了双卤代二聚体[{(Mg(IMES)(Br2)}2(μ-Cl2)2](11…
A series of neutral N-heterocyclic carbene (NHC) magnesium alkyl complexes was synthesized by reaction of IMes (IMes = 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene) and IPr (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) with Grignard reagents. In the presence of THF, the mononuclear species [Mg(IMes)(R)(Br)(THF)] (1, R = Me; 2, R = Et) and [Mg(IPr)(R)(Br)(THF)] (3, R = Me; 4, R = Et) were isolated. Complex 4 was further methylated to afford the Mg–THF adduct [Mg(IPr)(Me)2(THF)] (5), which crystallizes as the dimer [{(Mg(IPr)(Me)}2(μ-Me)2] (5′), thus evidencing the labile THF coordination in these systems. In contrast, in the presence of Et2O, the dinuclear Mg(II) species [{(Mg(NHC)(Br)}2(μ-Me)2] (6, NHC = IMes; 7, NHC = IPr), [{(Mg(IMes)(Ph)}2(μ-Br)2] (8), [{(Mg(IMes)(CH2Ph)}2(μ-Cl)2] (9), and [{(Mg(IPr)(Ph)}2(μ-Br)2] (10) were isolated and characterized. The protonolysis reaction between the protio ligand [IMes-H]Cl and EtMgBr afforded the Mg(II) dihalido dimer [{(Mg(IMes)(Br)}2(μ-Cl)2] (11...
影响因子：
16.6
作者：
Arrowsmith, Merle;Hill, Michael S.;Mahon, Marly F.
通讯作者：
Mahon, Marly F.