the carroll rearrangement is a rearrangement reaction in organic chemistry and involves the transformation of a β-keto allyl ester into a α-allyl-β-ketocarboxylic acid. this organic reaction can be followed by decarboxylation and the final product is a γ,δ-allylketone. the carroll rearrangement is an adaptation of the claisen rearrangement and effectively a decarboxylative allylation.