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Koschinsky, Rainer and Köhli, Thies-Peter and Mayr, Herbert (1988): Synthesis of highly alkylated functionalized cyclopentadienes. In: Tetrahedron Letters, Vol. 29, No. 44: pp. 5641-5644
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Abstract

Tetra- and pentaalkylated cyclopentadienyl ketones and carboxylic acids are prepared by electrophilic allylation of enolizible 1,3-dicarbonyl compounds and successive acid catalyzed cyclisation.