Achiral Organic, Inorganic, and Metal Crystals as Auxiliaries for Asymmetric Transformations

The use of achiral crystalline architectures as intermediate auxiliaries for the performance of “absolute” asymmetric transformations is reviewed. Such architectures are delineated, in some cases, by pairs of homochiral surfaces of opposite handedness. This phenomenon is more common among organic crystals that frequently appear in triclinic, monoclinic, orthorhombic, or tetragonal space groups. Consequently, the chiral surfaces of such crystals have been shown to display enantiomeric recognition for molecules of the environment, a process that has been instrumental in the conversion of achiral host crystals into enantiomorphous solid-solutions, for a successful performance of “absolute” asymmetric transformations and for the control of crystal polymorphism. Mixed crystals of reduced symmetry display properties such as second harmonic generation or pyroelectricity. On the other hand, achiral faces delineate metals, which crystallize in cubic space-groups of high symmetry. However, by slicing such crystals in particular directions, they might express homochiral high Miller index faces that contain homochiral kink sites, which have been successfully exploited in electrochemical separations of sugars and for the resolution of enantiomers by enantioselective desorption. Representative examples of each class of materials are described.

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