Samarium di-iodide is an efficient reagent for the reductive coupling of ketones or aldehydes and electron-deficient alkenes, whereby γ-lactones can be prepared in good yields from ethyl acrylate.
S. Fukuzawa, A. Nakanishi, T. Fujinami and S. Sakai, J. Chem. Soc., Chem. Commun., 1986, 624 DOI: 10.1039/C39860000624
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