Complete control of the rearrangement modes of enolates of .alpha.-allyloxy ketones: reversal from the [3,3]-Claisen to the [2,3]-Wittig pathway by the use of the metalated N,N-dimethylhydrazones
Complete control of the rearrangement modes of enolates of .alpha.-allyloxy ketones: reversal from the [3,3]-Claisen to the [2,3]-Wittig pathway by the use of the metalated N,N-dimethylhydrazones