A δ-alkylpalladium intermediate generated by carbopalladation of a double bond can be intramolecularly trapped by a β-diester or a β-keto ester enolate if a cyclopentane ring is formed. Otherwise, normal β-elimination is observed.
                                    如果形成
环戊烷环,则通过双键的碳
钯反应生成的δ-烷基
钯中间体可能被β-二酯或β-
酮酸酯烯醇化物分子内捕获。否则,观察到正常的β-消除。