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The bowl-shaped reaction environment created by the Lewis acid aluminum tris(2,6-diphenylphenoxide) has been utilized as an efficient template in intramolecular radical cyclizations. The pathway and the stereoselectivity of the radical cyclization can be altered by using this template. A schematic representation of the transition state of the template assisted reaction is shown on the right.
Ooi et al. (1997) studied this question.