Role of Zr,Al Hydride Intermediate Structure and Dynamics in Alkene Hydroalumination with XAlBu<sup>i</sup><sub>2</sub> (X = H, Cl, Bu<sup>i</sup>), Catalyzed by Zr η<sup>5</sup> Complexes
                                
                                    
                                        作者:Lyudmila V. Parfenova、Pavel V. Kovyazin、Ilya E. Nifant’ev、Leonard M. Khalilov、Usein M. Dzhemilev                                    
                                    
                                        DOI:10.1021/acs.organomet.5b00370
                                    
                                    
                                        日期:2015.7.27
                                    
                                    The zirconocene complexes L2ZrCl2 (L = C5H5, C5H4Me, Ind, C5Me5; L-2 = rac-Me2C(2-Me-4-Bu-t-C5H2)(2), meso-Me2C(2-Me-4-Bu-t-C5H2)(2), rac-Me2C(3-Bu-t-C5H3)(2), rac-Me2C(Ind)(2), rac-Me2Si(Ind)(2), and rac-C2H4(Ind)(2)) were tested as catalysts in alkene hydroalumination by the isobutylalanes XAlBu2i (X = H, Cl, Bu-i). A low-temperature NMR spectroscopy study on the structure and dynamics of Zr,Al intermediates formed in the L2ZrCl2-XAlBu2i systems showed that the intra- and intermolecular exchange in the bimetallic clusters, controlled by the steric factor of the eta(5) ligand and organoaluminum compound nature, determines the activity of the whole catalytic system.