Abstract
In the Wittig olefination reactions of Garner's aldehyde with certain nonstabilized ylides, the ( E)-alkenes could be produced as a major product by simply quenching the reactions with a large excess of MeOH at −78 °C. Even under the salt-free conditions, more than a 10:1 ratio of the ( E)- to ( Z)-alkene was resulted consistently from the ylides of a linear alkyl chain. Without addition of MeOH, usual selectivity for the ( Z)-alkene was obtained in a ratio of 94:6.
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