Abstract
The methylthiodiphenylphosphine oxide carbanion 1a reacted with ketones in a two step process, the first stage being reversible. Methyl vinyl sulfides are formed only when the elimination step was rapid. When the second step occurred at a slow rate. the sequence required the use of boron trifluoride etherate for completion. New methyl vinyl sulfides were prepared by reaction with various ketones, including enolisable and bulky compounds.
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