Abstract
The reactions of the zerovalent palladium complex [Pd 2(dba) 3]·CHCl 3 (dba=dibenzylideneacetone, PhCHCHC(O)CHCHPh), in the presence of bidentate phosphorus ligand L 2 and dioxygen, with esters of 3-oxopentanedioic acid (RCH 2COCH 2R) in diethylether, afford, in good yield, the palladocyclobutan-3-one compounds [Pd(CHRCOCHR)L 2] [R=CO 2Me, L 2=dppe, dppp, dppb, dppf]. The compounds [Pd(CHRCOCHR)L 2] [R=CO 2Me, L 2=dppe, dppp, dppb, dppf; R=CO 2Et, L 2=dppe] are also formed by treating dichloromethane solution of [Pd(COD)Cl 2] (COD= cyclo-octa-1,5-diene) with RCH 2COCH 2R in the presence of silver(I) oxide and the appropriate bidentate ligand. Ligand exchange reactions of [Pd(η 3-CHRCOCHR)(L′) 2], (R=CO 2Me, L′=PPh 3 or AsPh 3) complexes with appropriate chelating phosphorus donor ligand in dichloromethane have also afforded new complexes [Pd(CHRCOCHR)L 2] (L′=PPh 3, L 2=dppe, dppp; L′=AsPh 3, L 2=dppe, dppp, dppb, dppf). Spectroscopic data (IR, NMR, FAB MS) for the new compounds are reported.
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