Organocatalytic Dimerization of Ketoketenes.

[摘要]：A general method for the catalytic dimerization of ketoketenes is described. Tri-n-butylphosphine was found to be the optimal organocatalyst for the racemic reaction. When lithium iodide was used as an additive, the reaction was rendered selective for dimer formation (dimer/trimer ?16:1). Ring-opening reactions of the ketoketene dimers as well as preliminary studies toward the development of an asym. variant are also reported.

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