合成了含有(五甲基环戊二烯基)铱(III)单元的一组iridacycles [{C,N} Cp * Ir III -Cl]({C,N} =苯并[ h ]喹啉,二苯并[ f,h ]喹啉)并衍生为与BArF型阴离子缔合的阳离子[{C,N} Cp * Ir-NCMe] +。后者的盐因其在H 2中对HSiEt 3的潜在催化性能而进行了基准测试-释放测试反应。表现最佳的BArF型盐显示出能够以低的催化负载量(大约)促进反应的能力。乙腈,丙腈和一系列芳腈底物的自动串联氢化硅烷化为0.5–1 mol%。机理研究证实,Si-H键的亲电和杂合活化可初步形成硅烷-铱环加合物。通过X射线衍射分析解析了这种加合物的新实例的分子结构。理论上的考虑支持了施主-受主[{C,N} Cp * Ir III -H]→[SiEt 3 ] +({C,N} =苯并[ h ]喹啉基)的配方,其中阳离子甲硅烷基部分充当Z配体结合Ir和
InBr3-catalyzed reduction of ketones with a hydrosilane: deoxygenation of aromatic ketones and selective synthesis of secondary alcohols and symmetrical ethers from aliphatic ketones
An InBr3–Et3SiH reducing system was developed to selectively convert aliphatic ketones to a variety of secondary alcohols in moderate to good yields. An initial mixing of InBr3 and PhSiH3 was followed by the addition of aliphatic ketones and a solvent to afford the symmetrical ether derivatives.
Hydrosilylation of Ketones, Imines and Nitriles Catalysed by Electrophilic Phosphonium Cations: Functional Group Selectivity and Mechanistic Considerations
作者:Manuel Pérez、Zheng-Wang Qu、Christopher B. Caputo、Vitali Podgorny、Lindsay J. Hounjet、Andreas Hansen、Roman Dobrovetsky、Stefan Grimme、Douglas W. Stephan
DOI:10.1002/chem.201406356
日期:2015.4.20
efficient hydrosilylation of ketones, imines and nitriles at room temperature. In the presence of this catalyst, adding one equivalent of hydrosilane to a nitrile yields a silylimine product, whereas adding a second equivalent produces the corresponding disilylamine. [(C6F5)3PCl][B(C6F5)4] and [(C6F5)3PBr][B(C6F5)4] are also synthesised and tested as catalysts. Competition experiments demonstrate that the
亲电子phospho盐,[(C 6 F 5)3 PF] [B(C 6 F 5)4 ],在室温下催化酮,亚胺和腈的有效氢化硅烷化。在这种催化剂的存在下,向腈中加入一当量的氢硅烷会产生甲硅烷基苯丙胺产物,而添加第二当量的甲硅烷会产生相应的二甲硅烷基胺。[(C 6 F 5)3 PCl] [B(C 6 F 5)4 ]和[(C 6 F 5)3 PBr] [B(C 6 F 5)4也被合成并作为催化剂测试。竞争实验表明,该反应对以下官能团表现出选择性,其优先顺序为:酮>腈>亚胺>烯烃。计算研究表明,该反应机理涉及通过与with中心的相互作用而使SiH键初始活化。然后,活化的络合物协同作用于不饱和底物上。
Silyl formates as hydrosilane surrogates for the transfer hydrosilylation of ketones
作者:R. Martin Romero、Neethu Thyagarajan、Nora Hellou、Clément Chauvier、Timothé Godou、Lucile Anthore-Dalion、Thibault Cantat
DOI:10.1039/d2cc00666a
日期:——
A transfer hydrosilylation of ketones employing silyl formates as hydrosilane surrogates under mild conditions is presented. A total of 24 examples of ketones have been successfully converted to their corresponding silyl ethers with 61–99% yields in the presence of a PNHP-based ruthenium catalyst and silyl formate reagent. The crucial role of the ligand for the transformation is demonstrated.
介绍了在温和条件下使用甲硅烷基甲酸酯作为氢化硅烷替代物的酮的转移氢化硅烷化。在 PN H P 基钌催化剂和甲酸甲硅烷酯试剂存在下,共有 24 个酮类实例成功地转化为相应的甲硅烷基醚,产率为 61-99% 。证明了配体对转化的关键作用。
Iridacycles as Catalysts for the Autotandem Conversion of Nitriles into Amines by Hydrosilylation: Experimental Investigation and Scope
heterolytic activation of the Si–H bond. The molecular structure of a new example of such an adduct was resolved by X-ray diffraction analysis. Theoretical considerations support a donor–acceptor [C,N}Cp*IrIII-H]→[SiEt3]+ (C,N} = benzo[h]quinolinyl) formulation where the cationic silyl moiety acting as a Z ligand binds both Ir and H centers. Under the conditions of the catalysis, the latter adduct is assumed
合成了含有(五甲基环戊二烯基)铱(III)单元的一组iridacycles [C,N} Cp * Ir III -Cl](C,N} =苯并[ h ]喹啉,二苯并[ f,h ]喹啉)并衍生为与BArF型阴离子缔合的阳离子[C,N} Cp * Ir-NCMe] +。后者的盐因其在H 2中对HSiEt 3的潜在催化性能而进行了基准测试-释放测试反应。表现最佳的BArF型盐显示出能够以低的催化负载量(大约)促进反应的能力。乙腈,丙腈和一系列芳腈底物的自动串联氢化硅烷化为0.5–1 mol%。机理研究证实,Si-H键的亲电和杂合活化可初步形成硅烷-铱环加合物。通过X射线衍射分析解析了这种加合物的新实例的分子结构。理论上的考虑支持了施主-受主[C,N} Cp * Ir III -H]→[SiEt 3 ] +(C,N} =苯并[ h ]喹啉基)的配方,其中阳离子甲硅烷基部分充当Z配体结合Ir和