with alkali-metal cyclopentadienides generates isostructural half-sandwich chromium(III)-μ3-methylidynes [CpR3Cr3(μ2-Cl)3(μ3-CH)] (CpR=C5H5, C5Me5, C5H4SiMe3). Side and decomposition products of the Cl/CpR exchange reactions were identified and structurally characterized for [Cr4(μ2-Cl)4(μ2-I)2(μ4-O)(thf)4] and [(η5-C5H4SiMe3)CrCl(μ2-Cl)2Li(thf)2]. The Cl/CpR exchange drastically changed the ambient-temperature
deoxygenative homocoupling reaction of the allyl alcohol to give the corresponding 1,5-diene as a major product. In addition to the deoxygenative homocoupling product, the allyl amine into which aniline was introduced was also obtained by using 1,2-diphenylhydrazine in the reaction of 1,3-diphenyl-2-methylprop-2-en-1-ol. Oxovanadium(V)-catalyzed deoxygenative homocoupling reaction of benzyl alcohols could
Molybdenum-Catalyzed Cross-Coupling of Benzyl Alcohols: Direct C–OH Bond Transformation via [2 + 2]-Type Addition and Elimination
作者:Pan Zhou、Yuqiang Li、Tao XU
DOI:10.1021/acs.orglett.2c01537
日期:2022.6.17
Traditional cross-couplings catalyzed by transitionmetal catalysts generally rely on the classic oxidative addition–transmetalation–reductive elimination process, which requires low-valent precious metals and an inert atmosphere and which initiates from carbon–alide or pesudo carbon–halide bonds. Herein, an unprecedented molybdenum–oxo-complex-catalyzed intermolecular cross-coupling of benzyl alcohols
A Highly Efficient, Metal-Free and Convenient Diarylallyl Ether/Thioether Formation<i>via</i>Oxidative C-H Activation
作者:Yan Li、Weiliang Bao
DOI:10.1002/adsc.200800810
日期:2009.4
Abstractmagnified imageA metal free highly efficient and concise oxidative‐coupling ether formation between 1,3‐diarylallylic sp3 C‐H and aliphatic alcohols promoted by 2,3‐dichloro‐5,6‐dicyanoquinone (DDQ) is reported. This system is also applied to form CS bonds from 1,3‐diarylpropylene and thiols/thiophenols. The corresponding diarylallyl ethers/thioethers are obtained in good yields.
REDUCTIVE DIMERIZATION OF α,β-UNSATURATED KETONES BY LiAlH<sub>4</sub>–Fe<sub>3</sub>(CO)<sub>12</sub>–HCl REAGENT SYSTEM