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An interesting change in the stereochemical outcome of the Wittig olefination reaction under Boden's conditions (potassium bases and 18-crown-6 as the ylide forming reagent) is reported. This effect depends significantly on the polarity of the solvents and the nature of the ylide.
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We thank PEDECIBA (project URU 96/017) and TWAS for financial support. We specially thank Dr. David Gonzalez for his comments and suggestions.
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