Dynamic stereochemistry: mechanistic controversy in the silver oxide–bromine induced cyclizations of alcohols

Abstract
The abstraction of a diastereotopic hydrogen (1,4) in the silver oxide–bromine catalysed formation of tetrahydrofurans from three acyclic secondary alcohols has been shown to be stereoanalogous to the hydrogen abstraction in lead tetra-acetate generated alkoxy-radicals in the same molecules.

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