6 research outputs found
Alpha-Alkylidenecyclopentanones by Alpha-Alkylidation of Methyl 2-Oxocyclopentanecarboxylate
No full textAn α-alkylidation of cyclopentanone was achieved in two reaction steps in an overall yield of 20 to 79% via a zinc chloride-catalyzed thioalkylation of the zinc enolate of methyl 2-oxocyclopentanecarboxylate (3) and subsequent saponification/desulfurization of the β-(phenylthio) ketone intermediates 5. For the saponificatioddesuiurization step DABCO proved to be the reagent of choice and superior to the use of alkali or magnesium halides
Barium(II) complexes of calixcrowns derived from p-tert-butylcalix[5]arene as potential transacylation catalysts. Regio- and stereo-selective monoacylation of the calixcrown
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