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(A) Phosphoramide-catalyzed etherification of allylic alcohols, with (B) a stereochemical model of the carbocationic intermediate en route to major product 112. The red dotted line represents a cation–π interaction. The blue dotted line represents a hydrogen bond. The cyclohexyl rings of catalyst 110 are omitted for clarity. Adapted with permission from ref 93. Copyright 2011 American Chemical Society.
