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The titanate complex can be used as an asymmetric catalyst for the reaction of aldehydes with diethylzinc to give secondary alcohols with high ee. The system described enables the catalyst to be recycled with minimal loss of activity: Org. Process Res. Dev., 2, 18 (1998). For reviews of supported reagents and catalysts in organic synthesis, see: Synthesis, 1217 (1997); 1035 (2000)./n