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Bis(dibenzylideneacetone)palladium(O) reacts with various olefins in the presence of various ligands to give stable polefin-palladium(0) complexes.

S ~m ~a r y Bis(dibenzylideneacetone)palladium(O) reacts IN view of recent reports by Maitlis et al. l I a we report related with dimethyl acetylenedicarboxylate to give either results. Treatment of bis(dibenzy1ideneacetone)palladiumpalladiacyclopentadiene complexes or .rr-bonded acetylene (0) [(dba) 2Pd] (I) with dimethyl acetylenedicarboxylate complexes, according to the ligands.(mad) in acetone under nitrogen gave the palladiacyclo-

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