Double carbonylation reactions, acylpalladium

Treatment of the dimer of chloro entfo-5-[(Z)-prop-l-enyl]tricyclo[2.2.1.0 ]hept-e r/o-3-yl palladium with carbon monoxide in methanol afforded methyl 5-methyl-6-oxotet-racyclo[5.3.0.0 °.0 ]decane-4-carboxylate in 54% yield, which results from intramolecular acylpalladium addition to the double bond followed by carbonylation. An analogous reaction was involved when (exo-5-acetoxytricyclo[2.2.1.0 ]hept-ent/o-3-yl)chlorodipyridinepal-ladium was reacted successively with bis[( )-2-chlorovinyl]mercury and carbon monoxide in methanol. 

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