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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Half-sandwich ruthenium(ii) complexes with tethered arene-phosphinite ligands: synthesis, structure and application in catalytic cross dehydrogenative coupling reactions of silanes and alcohols
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Half-sandwich ruthenium(ii) complexes with tethered arene-phosphinite ligands: synthesis, structure and application in catalytic cross dehydrogenative coupling reactions of silanes and alcohols

机译:含有束缚芳烯 - 膦酸盐配体的半三明治钌(II)复合物:硅烷和醇催化交叉脱氢偶联反应的合成,结构和应用

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摘要

The preparation of the tethered arene-ruthenium(ii) complexes [RuCl2{eta(6):kappa(1)(P)-C6H5(CH2)(n)OPR2}] (R = Ph, n = 1 (9a), 2 (9b), 3 (9c); R = Pr-i, n = 1 (10a), 2 (10b), 3 (10c)) from the corresponding phosphinite ligands R2PO(CH2)(n)Ph (R = Ph, n = 1 (1a), 2 (1b), 3 (1c); R = Pr-i, n = 1 (2a), 2 (2b), 3 (2c)) is presented. Thus, in a first step, the treatment at room temperature of tetrahydrofuran solutions of dimers [{RuCl(mu-Cl)(eta(6)-arene)}(2)] (arene = p-cymene (3), benzene (4)) with 1-2a-c led to the clean formation of the corresponding mononuclear derivatives [RuCl2(eta(6)-p-cymene){R2PO(CH2)(n)Ph}] (5-6a-c) and [RuCl2(eta(6)-benzene){R2PO(CH2)(n)Ph}] (7-8a-c), which were isolated in 66-99% yield. The subsequent heating of 1,2-dichloroethane solutions of these compounds at 120 degrees C allowed the exchange of the coordinated arene. The substitution process proceeded faster with the benzene derivatives 7-8a-c, from which complexes 9-10a-c were generated in 61-82% yield after 0.5-10 h of heating. The molecular structures of [RuCl2(eta(6)-p-cymene){(Pr2PO)-Pr-i(CH2)(3)Ph}] (6c) and [RuCl2{eta(6):kappa(1)(P)-C6H5(CH2)(n)(OPPr2)-Pr-i}] (n = 1 (10a), 2 (10b), 3 (10c)) were unequivocally confirmed by X-ray diffraction methods. In addition, complexes [RuCl2{eta(6):kappa(1)(P)-C6H5(CH2)(n)OPR2}] (9-10a-c) proved to be active catalysts for the dehydrogenative coupling of hydrosilanes and alcohols under mild conditions (r.t.). The best results were obtained with [RuCl2{eta(6):kappa(1)(P)-C6H5(CH2)(3)(OPPr2)-Pr-i}] (10c), which reached TOF and TON values up to 117600 h(-1) and 57000, respectively.
机译:旋环芳烃 - 钌(II)配合物的制备[RuCl2 {Eta(6):Kappa(1)(P)-C6H5(CH 2)(N)OPR 2}](r = pH,n = 1(9a), 2(9b),3(9c); r = pr-1,n = 1(10a),2(10b),3(10℃),来自相应的亚膦酸盐配体R2PO(CH2)(n)pH(r = pH值,N = 1(1A),2(1B),3(1C); R = Pr-I,N = 1(2A),2(2B),3(2C))。因此,在第一步中,在二聚体四氢呋喃溶液的室温下处理[{RuCl(Mu-Cl)(Eta(6) - 砷)}(2)](Arene = P-CyheNe(3),苯( 4)用1-2A-C导致相应的单核衍生物的清洁形成[RuCl2(ETA(6)-P-CYMENE){R2PO(CH2)(N)pH}](5-6A-C)和[RuCl2(ETA(6) - 苯苯)(R2PO(CH2)(N)pH}](7-8A-C),其产率66-99%。随后加热这些化合物在120℃下的1,2-二氯乙烷溶液允许交换配位的芳烃。通过苯衍生物7-8A-C进展更快的取代过程,从加热0.5-10小时后,在61-82%的产率下产生复合物9-10a-c。 [RuCl2(ETA(6)-P-CYMENE){(PR2PO)-PR-I(CH2)(3)pH}](6C)和[RuCl2 {eta(6):Kappa(1)( P)-C6H5(CH2)(N)(OPPR2)-PR-I}](n = 1(10A),2(10B),3(10C))通过X射线衍射方法毫不含难地证实。此外,复合物[RuCl2 {ETA(6):Kappa(1)(P)-C6H5(CH2)(N)OPR 2}](9-10A-C)被证明是用于脱氢硅烷和醇的脱氢偶联的活性催化剂在温和条件下(RT)。用[ruCl2 {η(6):Kappa(1)(P)-C6H5(CH2)(3)(OPPR2)-PR-I}](10C)获得了最佳结果,该达到了TOF和TON值117600 H(-1)和57000分别。

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