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Highly unsaturated γ‐lactones are formed in good to high yields from 2‐(propargyl)allyl phosphates and carbon monoxide in the presence of a palladium catalyst (see scheme). The reaction proceeds efficiently under mild reaction conditions (at 80 °C under an ambient pressure of CO).

Carbonylative [5 + 1] Cycloaddition of Cyclopropyl Imines Catalyzed by Ruthenium Carbonyl Complex.-This offers a new method to prepare six-membered lactams of type (III), (V), and (VI). -(KAMITANI,