Synthesis and Reactivity of Five-Membered Palladalactone from Arylallenes and Carbon Dioxide Relevant to Catalytic Lactone Synthesis

摘要

Palladium(0)phosphine complexes catalyze the cyclization between arylallenes and carbon dioxide to yield six-membered lactones.The stoichiometric reaction of Pd(0)complex with leq of allene followed by the treatment with CO_2 resulted in the formation of five-membered palladalactones,whose structure was fully elucidated by various spectroscopies(e.g.NMR,IR,and X-ray).