2-dichloroalkane derivatives from olefins using NH4Cl and Oxone® at room temperature is described. A variety of terminal, internal, and cyclic alkenes reacted smoothly to give the corresponding dichlorinated products in good to excellent yields. Moreover, 1,2-disubstituted symmetrical and unsymmetrical olefins dichlorinated with moderate to excellent diastereoselectivity. This method precludes the use of
Ph3P/I–-promoted dichlorination and dibromination of epoxides by using XCH2CH2X (X = Cl or Br) as the halogen source and reaction solvent is described. All reagents are widely available and easy to handle, and mild conditions and operational simplicity make this protocol attractive.
Catalysis of Phosphorus(V)-Mediated Transformations: Dichlorination Reactions of Epoxides Under Appel Conditions
作者:Ross M. Denton、Xiaoping Tang、Adam Przeslak
DOI:10.1021/ol102010h
日期:2010.10.15
A stereospecific triphenylphosphine oxide-catalyzed 1,2-dichlorination reaction of epoxides has been developed. The reaction is effective for a range of terminal and internal epoxides. In contrast to the classical Appel-type dichlorination of epoxides, oxalyl chloride is used as a stoichiometric reagent to generate the chlorophosphonium salt responsible for dichlorination from catalytic triphenylphosphine
Mechanism of Dichlorination of n-Dodecane and Chlorination of 1-Chlorododecane Adsorbed on ZSM-5 Zeolite Molecular Sieves. A Supramolecular Structural Interpretation
作者:Nicholas J. Turro、Nianhe Han、Xue-gong Lei、James R. Fehlner、Lloyd Abrams
DOI:10.1021/ja00122a020
日期:1995.5
-chlorododecane (1CD) adsorbed on two pentasilzeolites (silicalite and LZ- 105) have been investigated. The results are explained in terms of a supramolecular model for which the mobile and diffusing chlorination reagents (CWC12) enter the zeolite particle from the external surface and diffuse preferentially along the linear channels of the zeolite internal surface that contain immobile adsorbed nD (or 1CD)
Photocatalytic, modular difunctionalization of alkenes enabled by ligand-to-metal charge transfer and radical ligand transfer
作者:Kang-Jie Bian、David Nemoto、Xiao-Wei Chen、Shih-Chieh Kao、James Hooson、Julian G. West
DOI:10.1039/d3sc05231a
日期:——
reaction manifolds driven by LMCT reactivity, a general and catalytic protocol for modular difunctionalization of alkenes remains unknown. Leveraging the synergistic cooperation of iron-catalyzed ligand-to-metal charge transfer and radical ligand transfer (RLT), here we report a photocatalytic, modular difunctionalization of alkenes using inexpensive iron salts catalytically to function as both radical initiator