Claisen rearrangement '' proceeds from an allylic alcohol to a γ , δ - unsaturated amide , and was developed by Albert Eschenmoser in 1964 .
Claisen rearrangement '' proceeds by heating allylic alcohols in the presence of '' N , N - '' dimethylacetamide dimethyl acetal to form γ , δ - unsaturated amide . 
 This was developed by Albert Eschenmoser in 1964 .