Cyclohexynes as intermediates in a novel endo-cyclization of alkynylzincates derived from 5-hexynyl tosylates
                                
                                    
                                        作者:Toshiro Harada、Takeshi Otani、Akira Oku                                    
                                    
                                        DOI:10.1016/s0040-4039(97)00481-4
                                    
                                    
                                        日期:1997.4
                                    
                                    The pi-type endo-cyclization of metal acetylides to form cyclohexynes was observed for the first time in the reaction of alkynylzincates derived from 5-hexynyl tosylates. The endo-cyclization took place in competition with exo-cyclization, leading to the formation of 1-(cyclopentylidene)alkylzincs. (C) 1997 Elsevier Science Ltd.