trans-2-Ethynyl substituted alcohols can be obtained by treatment of epoxides with ether-stabilised methyl ethynyl alanes; a cis analogue, obtained by oxidation and stereoselective reduction, has been converted into the corresponding cis ring-fused methylene lactone.
T. F. Murray, V. Varma and J. R. Norton, J. Chem. Soc., Chem. Commun., 1976, 907 DOI: 10.1039/C39760000907
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