Reactions of 1-(2-forrnyloxyethyl)-3-formyloxycycloalkenes 2 with samarium(II) iodide give hemiacetals 3 which are subsequently converted to spiro γ-butyrolactones 4.
K. Shibuya, H. Nagaoka and Y. Yamada, J. Chem. Soc., Chem. Commun., 1991, 1545 DOI: 10.1039/C39910001545
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