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The transmetalation of ketone lithium-enolates using MnBr2 generates manganese-enolates which react with CH3I to provide α-methylated ketones with essentially no undesired polyalkylated byproducts.
Transmetalation of Li-enolates by MnBr2 results in Mn-enolates which can be smoothly mono-methylaed, e.g.:
Abstract:
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