S. Lannersa, N. Khiria, G. Solladiéa, G. Hanquet. Ring-opening of lactones with enolate nucleophiles: a simple access to functionalised β-ketoesters, β,δ-diketoesters and β-ketosulfoxides// Tetrahedron Letters, Volume 46, Issue 4, 24 January 2005, Pages 619-622.
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http://dx.doi.org/10.1016/j.tetlet.2004.11.135