Alkylation of the 1,3-dianion of the β-ketosulphone (1) with 1,3-dibromopropane gave (3) which under appropriate conditions can be converted into either (6; C-alkylation) or (7; O-alkylation) without contamination with the other C- or O-alkylated isomer.
F. Cooke and P. Magnus, J. Chem. Soc., Chem. Commun., 1976, 519 DOI: 10.1039/C39760000519
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