1,2-H Shift in Copper−Chlorocarbenoid Intermediate during CuCl/bpy-Promoted Stereoselective Dechlorination of 2,2,2-Trichloroethyl Alkyl Ethers to (<i>Z</i>)-1-Alkoxy-2-chloroethenes
                                
                                    
                                        作者:Ram N. Ram、T. P. Manoj                                    
                                    
                                        DOI:10.1021/ol8006524
                                    
                                    
                                        日期:2008.6.5
                                    
                                    Reaction of 2,2,2-trichloroethyl alkyl ethers with 2 molar equiv of CuCl/bpy in refluxing DCE yielded (2)-1-alkoxy-2-chloroethenes stereoselectively as the major product via 1,2-H shift in copper-chlorocarbenoid intermediate. 2,2,2-Trichloroethyl carboxylates undergo a radical 1,2-acyloxy shift under similar conditions.