Zirconium compounds were known to be used mostly for forming zirconium enolates by transmetallation for a subsequent aldol addition.1,2,3,4,5,6,7 Preformed lithium enolates were transmetallated to yield predominantly (Z)- or (E)-zirconium enolates. Irrespective of the geometry of the zirconium enolates used a preference to syn-configured aldol adducts is observed. This methodology was also deployed in highly diastereoselective aldol reactions to obtain chiral aldol adducts (Scheme 3.1.6.1).8,9,10,11,12,13,14
In addition to that, zirconium(IV) alkoxides are able to deprotonate α-carbon atoms of ketones.15,16 By subsequent reactions with aldehydes the corresponding aldol adducts were formed.17 The regioselectivity of this aldol addition is illustrated in Scheme 3.1.6.2.
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(2009). Zirconium Lewis Acids. In: Mahrwald, R. (eds) Aldol Reactions. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-8701-1_13
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