Rearrangements of ethylene oxide derivatives. V. The boron trifluoride catalysed rearrangement of some 1,1-disubstituted ethylene oxides

Abstract
The boron trifluoride catalysed rearrangement of the unsymmetrical epoxide (3) to give aldehyde (5) proceeds by selective (c. 1.9: 1) migration of the hydrogen atom (Hb) cis to the methyl group.

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