By application of copper or tin Lewis acids in Mukaiyama aldol reactions mostly anti-configured aldol adducts of enolsilanes, pyruvates and glyoxylates electrophiles were detected. In contrast to that scandium complexes proved to be effective catalysts in syn-selective aldol additions of enolsilanes and ethylglyoxylate (Scheme 3.1.7.1).1
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(2009). Miscellaneous Lewis Acids. In: Mahrwald, R. (eds) Aldol Reactions. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-8701-1_14
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