作者:Jan Breitenfeld、Jesus Ruiz、Matthew D. Wodrich、Xile Hu
DOI:10.1021/ja4051923
日期:2013.8.14
nickel-based catalysts have been reported for cross-coupling reactions of nonactivated alkyl halides. The mechanistic understanding of these reactions is still primitive. Here we report a mechanistic study of alkyl-alkyl Kumada coupling catalyzed by a preformed nickel(II) pincer complex ([(N2N)Ni-Cl]). The coupling proceeds through a radical process, involving two nickel centers for the oxidative addition of alkyl
许多镍基催化剂已被报道用于非活化烷基卤化物的交叉偶联反应。对这些反应的机理理解仍然很原始。在这里,我们报告了由预先形成的镍 (II) 钳形配合物 ([(N2N)Ni-Cl]) 催化的烷基-烷基 Kumada 偶联的机理研究。偶联通过自由基过程进行,涉及两个用于烷基卤氧化加成的镍中心。催化作用在格氏试剂中为二级,在催化剂中为一级,在卤代烷中为零级。一种瞬态物质,[(N2N)Ni-烷基(2)](烷基(2)-MgCl),被确定为负责卤代烷活化的关键中间体,其形成是转换的决定步骤催化。
DEALUMINOXYLATION OF ALUMINUM ALLYL OR BENZYL ALKOXIDES AND DEOXYGENATION OF ALLYL ETHERS BY LITHIUM ALUMINUM HYDRIDE IN THE PRESENCE OF TITANIUM CATALYST
作者:Fumie Sato、Yasuji Tomuro、Hiroaki Ishikawa、Takeshi Oikawa、Masao Sato
DOI:10.1246/cl.1980.103
日期:1980.1.5
Various aluminumallyl and benzyl alkoxides and allylethers undergo hydrogenolysis by LiAlH4 in the presence of a catalytic amount of TiCl4 or Cp2TiCl2. Thus, the present reaction provides a convenient method for replacing oxygen-containing functional groups at the allylic or benzylic position by hydrogen.
Versatile etherification of alcohols with allyl alcohol by a titanium oxide-supported molybdenum oxide catalyst: gradual generation from titanium oxide and molybdenum oxide
Etherification using allyl alcohol to produce allyl ether via dehydration is a fundamental technique for producing fine chemicals that can be applied to electronic devices. We demonstrate a sustainable method to synthesize allyl ethers from allyl alcohol with various alcohols up to a 91% yield, with water as the sole by-product. In this reaction, the active catalyst is gradually generated as the reaction
Oxidation of acyclic alkenes and allyl and benzyl ethers with DIB/t-BuOOH/Mg(OAc)2
作者:Thanapat Sastraruji、Stephen G. Pyne、Alison T. Ung
DOI:10.1016/j.tet.2011.10.112
日期:2012.1
Oxidation of (11Z)-1′,2′-didehydrostemofoline with DIB/TBHP/Mg(OAc)2·4H2O resulted in oxidative cleavage of the C-11–C-12 double bond instead of the desired allylic oxidation of the 1-butenyl side chain. Stemofoline gave a similar result. The oxidation of more simple terminal alkenes was regioselective and gave vinyl ketones while allyl and benzyl ethers gave acrylate and benzoate esters, respectively
Facile O-Deallylation of Allyl Ethers via S<sub>N</sub>2‘ Reaction with <i>tert</i>-Butyllithium
作者:William F. Bailey、Michael D. England、Michael J. Mealy、Charnsak Thongsornkleeb、Lisa Teng
DOI:10.1021/ol991342g
日期:2000.2.1
[reaction: see text] Allylic ethers are converted to the corresponding alcohol or phenol in virtually quantitative yield at temperatures below ambient simply by stirring a hydrocarbon solution of the ether with 1 molar equiv of tert-butyllithium. The reaction, which produces 4,4-dimethyl-1-pentene as a coproduct, most likely involves an S(N)2' attack of the organolithium on the allyl ether.