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2-Ethoxy-3-methylidene-1,2λ5-oxaphospholan-2-one rings have been constructed by Pd(OAc)2–LiCl catalysed cyclization of 4-chlorobut-2-enyl ethyl alkynylphosphonate. A mechanism involving trans or cis halogenopalladation, followed by intramolecular insertion of a carbon–carbon double bond into a carbon–palladium bond and subsequent dehalogenopalladation, is briefly discussed.
C. Ma, X. Lu and Y. Ma, J. Chem. Soc., Perkin Trans. 1, 1995, 2683 DOI: 10.1039/P19950002683
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