No abstract

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-

1998ketones ketones (acyclic compounds) P 0200 -062Michael Reactions Promoted by η 1 -O-Enolatoruthenium(II) Complexes Derived from Ru(cod)(cot), Diphosphine, and Dimethyl Malonate.-The Michael reaction of 1,3-dicarbonyl compounds (I) and activated olefins (II) is carried out under mild conditions in the presence of a catalytic Ru(II) complex providing the corresponding bisadducts (III). -(ALVAREZ, S. G.; HASEGAWA, S.; HIRANO, M.; KOMIYA, S.; Tetrahedron Lett. 39 (1998) 29, 5209-5212; Dep. Appl. Chem., Tokyo Univ. Agric. Technol., Koganei, Tokyo 184, Japan; EN)