Debromination of the glycerol a-bromo cyclic acetals (IVa and IVb) by means of lithium in dimethoxyethane afforded alkenyl ethers which were shown by infrared and n.m.r. spectroscopy, vapor phase chromatography, and periodate titration to consist of a mixture of the cis-and trans-1-alkenyl-(111) and the cis-and trans-2alkenylglycerols ( V ) in the ratio of approximately 47:53, and of total cis to total trans compounds in the ratio of 4:5.
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