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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Ruthenium amino carboxylate complexes as asymmetric hydrogen transfer catalysts
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Ruthenium amino carboxylate complexes as asymmetric hydrogen transfer catalysts

机译:氨基钌羧酸络合物作为不对称氢转移催化剂

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The synthesis and characterization of optically active amino carboxylate complexes of formula [(η ~6-arene)Ru(Aa)Cl] (arene = C _6H _6, C _6Me _6, Aa = amino carboxylate) as well as those of the related trimers [{(η ~6-arene)Ru(Aa)} _3][BF _4] _3 are reported. Trimerization takes place with chiral self-recognition: only diastereomers equally configured at the metal, R _(Ru)R _(Ru)R _(Ru) or S _(Ru)S _(Ru)S _(Ru), are detected. The crystal structures of the complexes [(η ~6-C _6H _6)Ru(Pip)Cl] and [{(η ~6-C _6Me _6)Ru(Pro)} _3][BF _4] _3 have been determined by X-ray diffraction methods. Both types of complexes catalyse the hydrogen transfer reaction from 2-propanol to ketones with moderate enantioselectivity (up to 68% ee). The enantiodifferentiation achieved can be accounted for by assuming that Noyori's bifunctional mechanism is operating.
机译:式[(η〜6-芳烃)Ru(Aa)Cl](芳烃= C _6H _6,C _6Me _6,Aa =氨基羧酸盐)以及相关三聚体的旋光活性氨基羧酸盐配合物的合成与表征报告了[{(η〜6-芳烃基Ru(Aa)} _3] [BF _4] _3。三聚反应是通过手性自我识别进行的:只有在金属R_(Ru)R_(Ru)R_(Ru)或S_(Ru)S_(Ru)S_(Ru)上均等配置的非对映异构体检测到。配合物[(η〜6-C _6H _6)Ru(Pip)Cl]和[{(η〜6-C _6Me _6Me _6Me _6)Ru(Pro)} _3] [BF _4] _3的晶体结构已确定X射线衍射法。两种类型的络合物均以中等对映选择性(最高ee为68%)催化从2-丙醇到酮的氢转移反应。可以通过假设Noyori的双功能机制起作用来解释实现的对映分化。

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