Abstract
At −60°C and in ether, the organolitium reagent produced by trimethylsilyl 4,4-ethylenedioxypentanoate reacts with aldehydes and ketones, and gives the expected β-hydroxyacids. The β-ethylenic ketones are isolated when the condensation is carried out with aromatic aldehydes and ketones. This proves to be an efficient route for carbonyl olefination.
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