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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis and characterization of complexes containing Ti-O-Si moieties. Catalytic activity in olefin epoxidation
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Synthesis and characterization of complexes containing Ti-O-Si moieties. Catalytic activity in olefin epoxidation

机译:含Ti-O-Si部分的配合物的合成与表征。烯烃环氧化中的催化活性

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Reaction of [Cp*TiMe3] with O(SiPh2OH)(2) yields the titanium siloxide derivative [Cp*TiMe-{(OSiPh2)(2)O}] (1). Complex 1 reacts with H,O to yield the corresponding oxo-titanium derivative [(Cp*Ti{(OSiPh2)(2)O})(2)(mu-O)] (2). The molecular structure of complex 2 has been established by X-ray diffraction. Complex I reacts with triphenylsilanol to give the asymmetric titanium siloxide [Cp*Ti(OSiPh3){(OSiPh2)(2)O}] (3). Treatment of the dinuclear titanium compound [(Cp*TiCl2)(2){mu-(OSiPh2)(2)O}(mu-O)] (4) in with an equimolar amount of O(SiPh2OH)(2) yields complex [(Cp*TiCl)(2){mu-(OSiPh2)(2)O}(mu-O)] (4) in which the disiloxide moiety is bridging two titanium atoms. The structure of 4 has been determined by X-ray diffraction. Reaction of [Cp*TiMe3] With HOSiPh3 yields the titanium triphenylsiloxide [Cp*TiMe2 (OSiPh3)] (5). Complex 5 reacts with water to yield [{Cp*TiMe(OSiPh3)}(2)(mu-O)] (6). The triflate compound [Cp*Ti(OSiPh3)(2)(OTf)] (7) can be prepared by reaction of 5 with HOTf and triphenylsilanol. We have tested the catalytic activity of some of the complexes in the epoxidation of cyclohexene.
机译:[Cp * TiMe3]与O(SiPh2OH)(2)反应生成钛硅氧化物衍生物[Cp * TiMe-{(OSiPh2)(2)O}](1)。配合物1与H,O反应生成相应的氧钛衍生物[[Cp * Ti {(OSiPh2)(2)O})(2)(mu-O)](2)。配合物2的分子结构已经通过X射线衍射确定。配合物I与三苯基硅烷醇反应生成不对称的氧化硅钛[Cp * Ti(OSiPh3){(OSiPh2)(2)O}](3)。用等摩尔量的O(SiPh2OH)(2)处理双核钛化合物[(Cp * TiCl2)(2){mu-(OSiPh2)(2)O}(mu-O)](4) [(Cp * TiCl)(2){mu-(OSiPh2)(2)O}(mu-O)](4),其中二氧化物部分桥接两个钛原子。 4的结构已经通过X射线衍射确定。 [Cp * TiMe3]与HOSiPh3反应生成三苯基氧化钛钛[Cp * TiMe2(OSiPh3)](5)。配合物5与水反应产生[{Cp * TiMe(OSiPh3)}(2)(mu-O)](6)。三氟甲磺酸酯化合物[Cp * Ti(OSiPh3)(2)(OTf)](7)可以通过5与HOTf和三苯基硅烷醇反应来制备。我们已经测试了某些配合物在环己烯环氧化中的催化活性。

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