Diastereoisomeric αα-disubstituted β-hydroxy-acids have been converted into β-lactones, which on refluxing in collidine yielded E- or Z-olefins with high stereoselectivity. The mechanisms of these transformations are discussed.
S. Mageswaran and M. U. S. Sultanbawa, J. Chem. Soc., Perkin Trans. 1, 1976, 884 DOI: 10.1039/P19760000884
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