Direct cyanomethylation of aliphatic and aromatic hydrocarbons with acetonitrile over a metal loaded titanium oxide photocatalyst
作者:Emiko Wada、Tomoaki Takeuchi、Yuki Fujimura、Akanksha Tyagi、Tatsuhisa Kato、Hisao Yoshida
DOI:10.1039/c7cy00365j
日期:——
photocatalyst or a physical mixture of the Pt/TiO2 photocatalyst and a Pd catalyst supported by Al2O3, while it was hardly promoted by the Pt/TiO2 photocatalyst alone. The temperature dependence of the reaction rate proved that the Pd nanoparticles on the TiO2 photocatalyst thermally function as a metal catalyst. These results clearly suggest that the Pd metal catalyst is necessary for the cyanomethylation
负载铂的TiO 2(Pt / TiO 2)光催化剂促进了乙腈对脂族烃(即环己烷和环己烯)的氰甲基甲基化作用,其中光生空穴将乙腈和脂族烃的C–H键氧化解离形成相应的自由基之间的自由基交叉偶联。在这些反应中,Pt / TiO 2光催化剂比Pd / TiO 2光催化剂更具活性。相反,Pd / TiO 2光催化剂或Pt / TiO 2光催化剂与Al 2 O 3负载的Pd催化剂的物理混合物促进了苯的氰基甲基化。,而仅靠Pt / TiO 2光催化剂几乎没有促进。反应速率的温度依赖性证明,Pd纳米颗粒在TiO 2上光催化剂在热方面起金属催化剂的作用。这些结果清楚地表明,Pd金属催化剂对于苯的氰基甲基化是必需的。然而,在脂族烃的氰基甲基化中,未观察到金属颗粒的催化作用,这意味着自由基偶联在没有金属催化的情况下发生。因此,可以得出结论,在苯氰甲基化的情况下,Pd纳米颗粒具有双重作用,既可以作为催化剂催化苯与
Organic processes initiated by non‐classical energy sources
accomplished an efficient and mild multiple deuteration method for alkanescatalyzed by the combined use of heterogeneous platinum on carbon (Pt/C) and rhodium on carbon (Rh/C) catalysts in i-PrOD-d8 and D2O as a mixed solvent. The present multi-deuteration could be initiated by the transition metal-catalyzed dedeuteration of i-PrOD-d8 to produce D2 and the subsequent C–H bond activation of alkanes catalyzed
我们已经在i -PrOD- d 8和D 2 O中将异质碳载铂(Pt / C)和铑碳载(Rh / C)催化剂组合使用,实现了一种高效,温和的多重氘烷烃催化方法。混合溶剂。当前的多重氘化可以通过过渡金属催化的i -PrOD- d 8的氘化反应产生D 2以及随后的由Pt / C和/或Rh / C-D催化的烷烃的C–H键活化而引发。2复杂。该方法可用于在温和条件下将多种线性,支链和环状烷烃作为有用的氘代物质进行氘化。