Abstract
The reaction of aryl and alkenyl iodides and bromides with highly acidic ketones in the presence of CO (40–45 atm), NEt 3 (1–2 equiv.), and 5 mol% of Cl 2Pd(PPh 3) 2 in DMF at 100°C provides the corresponding enol carboxylates formed via trapping of putative acylpalladiums with O-enolates. In cases where alkenyl halides are used, the initially formed products can cyclize to give the corresponding lactones.
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