Pure Z-alkenes are obtained stereospecifically from erythro-alcohols (3) formed on addition of Ph2PO-stabilised anions to aldehydes; acylation of the same anions, reduction of the α-Ph2P(O) ketones (5) to the threo-alcohol (6), and elimination gives pure E-alkenes.
A. D. Buss and S. Warren, J. Chem. Soc., Chem. Commun., 1981, 100b DOI: 10.1039/C3981000100B
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