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。
AsCat and FurCat: new Pd catalysts for selective room-temperature Stille cross-couplings of benzyl chlorides with organostannanes
作者:Thomas O. Ronson、Jonathan R. Carney、Adrian C. Whitwood、Richard J. K. Taylor、Ian J. S. Fairlamb
DOI:10.1039/c4cc09810b
日期:——
Two novel succinimide-based palladium complexes, AsCat and FurCat, are highly efficient catalysts for room-temperature Stille cross-coupling of organostannanes with benzyl chlorides.
Use of Trifluoromethyl Groups for Catalytic Benzylation and Alkylation with Subsequent Hydrodefluorination
作者:Jiangtao Zhu、Manuel Pérez、Christopher B. Caputo、Douglas W. Stephan
DOI:10.1002/anie.201510494
日期:2016.1.22
The electrophilic organofluorophosphonium catalyst [(C6F5)3PF][B(C6F5)4] is shown to effect benzylation or alkylation by aryl and alkyl CF3 groups with subsequenthydrodefluorination, thus resulting in a net transformation of CF3 into CH2–aryl fragments. In the case of alkyl CF3 groups, Friedel–Crafts alkylation by the difluorocarbocation proceeded without cation rearrangement, in contrast to the corresponding
亲电子性有机氟phosph催化剂[(C 6 F 5)3 PF] [B(C 6 F 5)4 ]显示出通过芳基和烷基CF 3基团进行苄基化或烷基化,随后进行加氢脱氟,从而导致CF的净转化3成CH 2-芳基片段。在烷基CF 3基团的情况下,与烷基单氟化物的相应反应相反,通过二氟碳羰基化进行的Friedel-Crafts烷基化反应没有阳离子重排。
Dichloro-Bis(aminophosphine) Complexes of Palladium: Highly Convenient, Reliable and Extremely Active Suzuki-Miyaura Catalysts with Excellent Functional Group Tolerance
作者:Jeanne L. Bolliger、Christian M. Frech
DOI:10.1002/chem.200903309
日期:2010.4.6
systems, is a highlyconvenient, reliable, and extremelyactive Suzuki catalyst with excellentfunctionalgrouptolerance that enables the quantitative coupling of a wide variety of activated, nonactivated, and deactivated and/or sterically hindered functionalized and heterocyclic aryl and benzyl bromides with only a slight excess (1.1–1.2 equiv) of arylboronic acid at 80 °C in the presence of 0.2 mol % of
Abstract Raney Ni‐Al alloy in a dilute alkaline aqueous solution has been shown to be a powerful reducing agent, which is highly effective in the reduction of benzophenones to the corresponding hydrocarbon derivatives, in the absence of any organic solvents.