The allylation of aromatic aldehydes with allyltrichlorosilanes can be catalyzed by the new Lewis basic organocatalyst quinox with high enantioselectivity for electron-poor aldehydes and low for their electron-rich congeners (see scheme). This behavior suggests an arene–arene interaction of the electron-rich catalyst with the incoming aldehyde as the main factor determining the enantiofacial selectivity.
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