Abstract
Abstract Several Cp(allyl)- and (Cp(allyl)(conjugated diene) zirconium complexes were prepared from CpZrCl 3 and shown to undergo interesting types of rearrangements. The 12-electron organometallic Lewis acids CpZrCl 3 itself forms adduct complexes [CpZrCl 3 L 2 ] or [CpZrCl 3 L] 2 with various two-electron donor ligands, e.g. with many organic carbonyl compounds. These were found to undergo rapid intermolecular exchange with the free L species in solution. This opened up ways of employing organometallic CpZrCl 3 L Lewis acids as catalysts in organic synthesis. The chiral (diborna-Cp)ZrCl 3 system is an efficient catalyst for an enantioselective aldol addition type carbobcarbon coupling reaction.
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