is not possible and a donating solvent, such as THF, must be invoked.At present, X-ray diffraction analysis provides the most efficient method for obtaining structural models for the reactions in Figure 2. Consequently, we will continue to seek structural information for additional molecular aggregates that will elaborate on the complexes depicted in Figure 2 and expand upon the role of "molecular preorganization"13 and/or "complex induced proximity effects"14 in the aldol reaction. Supplementary Material Available: Full crystallographic details including atomic coordinates, thermal parameters, bond angles, bond lengths, and a thermal ellipsoid plot (8 pages). Ordering information is given on any current masthead page.(13) Cram, D.

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