Conjugated enallene ester

The results imply that the conjugated enallene ester system (l,2,4-alkatriene-3-carboxylate) 127 is required for incoiporation of the second molecule of carbon monoxide, and the following mechanism (Scheme 11-39) has been proposed. The formation of the palladacyclopentene 137 from 136 is suggested as an intermediate of 140. Then carbon monoxide insertion into the palladacycle 137 generates the acylpalladium 138. Subsequent reductive elimination affords the cyclopentenone 139, which isomerizes to give the cyclopentenone 140 as a final product. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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