Synthesis and structure of air-stable Lewis acidic binuclear complex of zirconocene pentafluorophenylsulfonate and its catalytic application in the allylation of carbonyl compounds with tetraallyltin

摘要

Air-stable Lewis acidic μ~2-hydroxy bridged binuclear complex of zirconocene pentafluorophenylsulfonate was successfully synthesized and found to show high catalytic efficiency in chemoselective allylation of carbonyl compounds with tetraallyltin in aqueous methanol media.rnCationic zirconocene compounds have attracted much attention in the past decade due to their applications in polymerization, ring opening, and acetylation reactions. Of the most interesting is zirconocene dichloride (Cp_2ZrCl_2) and its derivatives since they have been regarded as stable non-hazardous organometallic compounds and ideal catalysts. However, Cp_2ZrCl_2 has rarely been used as Lewis acid in organic synthesis on account of its weak acidity. In general, an organometallic Lewis acid should be as strongly acidic as possible for enhancement of activity.