An efficient method for the dehydrogenative coupling of silanes with alcohols under photocatalysis was developed. The reaction proceeded in the presence of Ru(bpy)3Cl2 (0.5 mol%) under visible light irradiation in acetonitrile at room temperature. The developed methodology was also applicable for the synthesis of silanols using water as a coupling partner.
compounds featuring nitrogen atoms are typically regarded as Lewis bases and are extensively employed as donor ligands in coordination chemistry or as nucleophiles in organic chemistry. By contrast, electrophilic nitrogen-containing compounds are much rarer. Nitrenium cations are a new family of nitrogen-based Lewis acids, the reactivity of which remains largely unexplored. In this work, nitrenium
Metal-free transfer hydrogenation of olefins via dehydrocoupling catalysis
作者:Manuel Pérez、Christopher B. Caputo、Roman Dobrovetsky、Douglas W. Stephan
DOI:10.1073/pnas.1407484111
日期:2014.7.29
species that mimics that of transitionmetalcomplexes. In this report, the Lewis acidic phosphonium salt [(C6F5)3PF][B(C6F5)4] 1 is shown to catalyze the dehydrocoupling of silanes with amines, thiols, phenols, and carboxylic acids to form the Si-E bond (E = N, S, O) with the liberation of H2 (21 examples). This catalysis, when performed in the presence of a series of olefins, yields the concurrent formation
近年来主族化学的一个重大进展是出现了模拟过渡金属配合物的主族物种的反应性。在这份报告中,路易斯酸性鏻盐 [(C6F5)3PF][B( )4] 1 显示出催化硅烷与胺、硫醇、酚和羧酸的脱氢偶联形成 Si-E 键 (E = N, S, O) 释放 H2(21 个例子)。这种催化,当在一系列烯烃的存在下进行时,会同时形成烯烃的脱氢偶联和转移氢化产物(30 个实施例)。这种反应性为烯烃加氢的无金属催化提供了一种策略。实验和密度泛函理论计算提出并支持了这两种催化反应的机制。
Mild synthesis of silyl ethers <i>via</i> potassium carbonate catalyzed reactions between alcohols and hydrosilanes
作者:Nicholas A. DeLucia、Nivedita Das、Aaron K. Vannucci
DOI:10.1039/c8ob00464a
日期:——
A method has been developed for the silanolysis of alcohols using an abundant and non-corrosive base K2CO3 as a catalyst. Reactions between a variety of alcohols and hydrosilanes generate silyl ethers under mild conditions. The use of hydrosilanes leads to the formation of H2 as the only byproduct thus avoiding the formation of stoichiometric strong acids. The mild conditions lead to a wide scope of
已经开发出一种使用大量且无腐蚀性的碱K 2 CO 3作为催化剂进行醇的硅烷化的方法。在温和的条件下,各种醇与氢硅烷之间的反应会生成甲硅烷基醚。使用氢硅烷导致形成H 2作为唯一的副产物,因此避免了化学计量的强酸的形成。温和的条件导致广泛的可能的醇底物和良好的官能团耐受性。在存在反应性CH键的情况下,还可以观察到选择性醇硅烷分解,这使得该方法可广泛用于保护基化学中。
Regioselective Iridium-Catalyzed Asymmetric Monohydrogenation of 1,4-Dienes
作者:Jianguo Liu、Suppachai Krajangsri、Thishana Singh、Giulia De Seriis、Napasawan Chumnanvej、Haibo Wu、Pher G. Andersson
DOI:10.1021/jacs.7b06829
日期:2017.10.18
A highly efficient regio- and enantioselective monohydrogenation of 1,4-dienes has been realized using an iridium catalyst with a chiral N,P-ligand under mild conditions. The substrate scope was studied and included both unfunctionalized as well as functionalized substituents on the meta- or para-position. Substrates having substituents with functionalities such as silyl protected alcohols or ketals