Efficient and selective alkylation of arenes and heteroarenes with benzyl and allyl ethers using a Ir/Sn bimetallic catalyst
作者:Susmita Podder、Sujit Roy
DOI:10.1016/j.tet.2007.06.068
日期:2007.9
A high-valent heterobimetallic catalyst namely [Ir2(COD)2(SnCl3)2(Cl)2(μ-Cl)2] (5 mol %), or dual catalyst system of [Ir(COD)Cl]2 (1 mol %) and SnCl4 (4 mol %), promotes the benzylation or allylation of arenes and heteroarenes using ethers as the alkylating agents. An electrophilic mechanism is proposed from a Hammett correlation.
Mild Friedel–Crafts Reactions inside a Hexameric Resorcinarene Capsule: C−Cl Bond Activation through Hydrogen Bonding to Bridging Water Molecules
作者:Pellegrino La Manna、Carmen Talotta、Giuseppe Floresta、Margherita De Rosa、Annunziata Soriente、Antonio Rescifina、Carmine Gaeta、Placido Neri
DOI:10.1002/anie.201801642
日期:2018.5.4
Calculations showed that there are catalytically relevant hydrogen‐bonding interactions between the bridging water molecules of the capsule and benzyl chloride, which is fundamental for the activation of the C−Cl bond. The capsule controls the reaction outcome. Inside the inner cavity of the capsule, N‐methylpyrrole is preferentially benzylated in the unusual β‐position while mesitylene reacts faster than 1
Friedel-Crafts Benzylation of Arenes over Mixed Oxides
作者:Sujit R. Jadhav、Manohar R. Sawant
DOI:10.1002/jccs.200400021
日期:2004.2
The replacement of liquid acid catalyst by solid acids for the Friedel-Crafts reaction of aromatic alkylation is a challenging task. Mixed oxide possessing spinel structures were found to catalyze the Friedel-Craftbenzylation of arenes. It was found that the reaction was very fast at 80 °C, hence the reaction was studied with respect to more substrate. The significant point was even at this temperature
用固体酸代替液体酸催化剂用于芳族烷基化的傅克反应是一项具有挑战性的任务。发现具有尖晶石结构的混合氧化物催化芳烃的傅-克苄基化。发现反应在 80 °C 时非常快,因此研究了更多底物的反应。重要的一点是即使在该温度下也实现了以对位异构体为主的单苄基化。采用共沉淀法制备混合氧化物,并采用XRD技术对其进行表征。
Mesoporous zirconium phosphate catalyzed reactions: Synthesis of industrially important chemicals in solvent-free conditions
作者:Apurba Sinhamahapatra、Narottam Sutradhar、Biplab Roy、Abhijit Tarafdar、Hari C. Bajaj、Asit Baran Panda
DOI:10.1016/j.apcata.2010.06.016
日期:2010.9.15
benzylation reaction. The effect of acid strength of catalyst, reaction time, temperature and amount of catalyst towards Friedel–Craft benzylation reaction are also studied. The m-ZrP is highly active towards other acid catalyzed reactions in solvent-free conditions. The catalytic activity of m-ZrP is much higher than that of conventional layered ZrP. The catalysts were separated easily from reaction mixture
Green, Mild, and Efficient Friedel–Crafts Benzylation of Scarcely Reactive Arenes and Heteroarenes under On‐Water Conditions
作者:Pellegrino La Manna、Annunziata Soriente、Margherita De Rosa、Antonio Buonerba、Carmen Talotta、Carmine Gaeta、Placido Neri
DOI:10.1002/cssc.201900137
日期:2019.4.23
The catalytic strategy exploits the hydrophobicity of the resorcinarene macrocycle 1 a. The proposed mechanism is based on the activation of benzylchloride by H‐bonding interactions with catalyst 1 a. In fact, under on‐water conditions the hydrophobic amplification of the strength of the H‐bonding interactions between the OH groups of the resorcinarene catalyst and the chlorine atom of benzyl chloride