Abstract
Methyl 2-(4,4-dimethyl-2,6-dioxocyclohexylidene)3,3,3-trifluoropropionate III was synthesized in 88% yield by condensation of 5,5-dimethylcyclohexane-1,3dione I with methyl trifluoropyruvate II. The reaction was carried out by successively adding dione II and SOCl2 to a mixture of dimedone I and pyridine in benzene. The F NMR spectrum of the resulting ylide III contained the singlet signal of CF3-group at 18.68 ppm, which was characteristic of trifluoromethylcontaining ylides [1].
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