Reverse orientation in the 1,3-dipolar cycloaddition of some pyridinium betaines to unsymmetrical alkenes
Abstract
Analysis of the products formed by the addition of N-phenylpyridium betaines to some unsymmetrical alkenes revealed that the 2-methyl-or-mehtyl-or 2-phenyl-N-phenylpyridinium betaine tends to form the reverse orientation products, whereas the unsubstituted N-phenylpyridium betaine gives the expected orientation.