First Catalytic Asymmetric Aldol-Tishchenko Reaction-Insight into the Catalyst Structure and Reaction Mechanism J.P.M. gratefully acknowledges receipt of an NSF Career Award (CHE-9875488), a David and Lucile Packard Fellowship and a DuPont Young Professor Grant. Support from Amoco Chemicals is also appreciated. The authors thank Prof. Joseph Templeton for helpful discussions and Andrew Larsen of the Gagné research group for assistance with vapor pressure osmometry experiments.