Platina- and palladalactam complexes derived from 2-benzoylacetanilide; syntheses and X-ray structure of [Pd{NPhC(O)CHC(O)Ph}(bipy)]center dot CH2Cl2

Reactions of the complexes [PtCl2(cod)] (cod = cyclo-octa-1,5-diene), cis-[ PtCl2(PPh3)(2)], and [PdCl2(bipy)] (bipy = 2,2'-bipyridine) with 2-benzoyla cetanilide and excess silver(I) oxide gives metallalactam complexes [M{PhNC (O)CH(COPh)}L-2] in good yields. The complexes have been characterised by N MR and IR spectroscopies, elemental analysis, and electrospray mass spectro metry (ESMS). A single-crystal X-ray structure of the bipy palladium comple x reveals the expected four-membered ring system, which is almost planar. N o evidence was observed for platinum-oxygen bonded products, which were a p ossibility based on the result of the related system involving PhC(O)CH2C(O )CH2C(O)Ph reported in the literature, which yielded a six-membered dienedi olate platinacycle. (C) 1999 Elsevier Science S.A. All rights reserved.