Alk-4-enyl bromides and iodides 1, when treated with the tributyltin hydride/CO system, undergo carbonylative cyclisation to give Cyclopentanones in good yields (AIBN cat., benzene, 75–90 atm, [1]= 0.025–0.05 mol dm–3, 80 °C, 2–3 h).
I. Ryu, K. Kusano, M. Hasegawa, N. Kannbe and N. Sonoda, J. Chem. Soc., Chem. Commun., 1991, 1018 DOI: 10.1039/C39910001018
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