Formation and Reactivity of Novel Pyranosidic Nicholas Oxocarbenium Ions:  Access to <i>C</i>-Ketosides and Branched-Chain <i>C</i>-Ketosides
                                
                                    
                                        作者:Ana M. Gómez、Clara Uriel、Serafín Valverde、J. Cristóbal López                                    
                                    
                                        DOI:10.1021/ol060929+
                                    
                                    
                                        日期:2006.7.1
                                    
                                    Dicobalt hexacarbonyl propargyl complexes, prepared from alkynyl ketoses, display an unexpected reactivity when treated with Lewis acids in the presence of nucleophiles and furnish C-ketosides, branched-chain C-ketosides, or branched-chain C-glycals depending on the nucleophile and the carbohydrate starting material.