The anionic intermediate (Ia) derived by treatment of the oxoazetidinesulphenic acid (I) with lithium di-isopropylamide in tetrahydrofuran at –126° undergoes exclusive O-alkylation to give the sulphenate (III).
G. A. Koppel and S. Kukolja, J. Chem. Soc., Chem. Commun., 1975, 57 DOI: 10.1039/C39750000057
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