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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Rhodium hydride formation in the presence of a bulky monophosphite ligand: a spectroscopic and solid-state investigation
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Rhodium hydride formation in the presence of a bulky monophosphite ligand: a spectroscopic and solid-state investigation

机译:庞大的单亚磷酸酯配体存在下氢化铑的形成:光谱和固态研究

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摘要

A study has been carried out on rhodium catalyst preforming when modified with the bulky tris(2,4-di-tert-butylphenyl) phosphite,P(Obtbp)_3.X-Ray crystal structure determinations of a tropolone-type precursor complex [Rh(TropBr_3)(CO){P(Obtbp)_3}].P(Obtbp)_3 centre dot CH_3COCH_3 (TropBr_3 = 3,5,7-tribromotropolonate) and the free P(Obtbp)_3 ligand are reported.Systematic in situ IR and NMR studies of the particular rhodium phosphite modified catalyst and its precursors have led to the identification of two distinct rhodium hydride species.A {~1H,~(31)P} HMBC NMR experiment afforded clarity on the ~(31)P NMR spectra observed under hydroformylation conditions.The species were identified as [HRh(CO)_3{P(Obtbp)_3}] and [HRh(CO)_2{P(Obtbp)_3}_2].Attention was also given to the rate of atalyst formation when starting from different rhodium precursors.
机译:已经研究了用大体积的亚磷酸三(2,4-二叔丁基苯基)酯修饰铑催化剂的预成型,P(Obtbp)_3。对酮类前体配合物[Rh]的X射线晶体结构测定(TropBr_3)(CO){P(Obtbp)_3}]。P(Obtbp)_3中心点CH_3COCH_3(TropBr_3 = 3,5,7-tribromotropolonate)和游离的P(Obtbp)_3配体被报道。系统的原位红外亚磷酸铑修饰的催化剂及其前驱体的NMR和NMR研究已经鉴定出两种不同的氢化铑物种。{〜1H,〜(31)P} HMBC NMR实验为〜(31)P NMR光谱提供了清晰度在加氢甲酰化条件下观察到。该物种被鉴定为[HRh(CO)_3 {P(Obtbp)_3}]和[HRh(CO)_2 {P(Obtbp)_3} _2]。还应注意催化剂的速率从不同的铑前体开始形成。

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