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Control of intramolecular γ-alkylation vs. α-alkylation of an αβ-unsaturated ketone: An unusual solvent effect
(Royal Society of Chemistry, 1979)
Most base-solvent combinations convert (2) into (3); γ-alkylation to yield (5) is effected by sodium hydroxide in dimethyl sulphoxide-water mixtures in which the water content is critical.