Preparation of a Series of Chalcogenolate-Bridged Diruthenium Complexes and Their Catalytic Activities toward Propargylic Substitution Reactions

摘要

A series of chalcogenolate(Se,Te)-bridged diruthenium complexes (neutral and cationic)as well as their allenylidene complexes have been newly prepared,and their catalytic activites toward the propargylic substitution reactions have been compared with those using the corresponding thiolate(S)-bridged complexes.Results of both catalytic and stoichiometric reactions using these complexes together with their reox properties show that the ease of the charge transfer from one Ru atom (working as an electron pool)to the other in the complexes (synergistic effect)may be one of teh important factors in promoting a key ligand exchange step for tese catalytic reactions.The finding presented here may provide a new possibility of polynuclear transition metal complexes for organic transformations.