SYNTHESIS, AND SOLUTION AND SOLID-STATE STRUCTURES OF PHINO)PHENYL]-4,5-DIHYDROOXAZOLE-P,N)PALLADIUM(II) HEXAFLUOROPHOSPHATES - COMPARISON WITH O)PHENYL]-4,5-DIHYDRO-4-PHENYLOXAZOLE-P,N)ZINC(II)

Crystal and solution structures of the [Pd-II(eta(3)-allyl)] and of th e [Pd-II(eta(3)-1,3-diphenylallyl)] complexes, 4 and 5, respectively, with -[2'-(diphenylphosphino)phenyl]-4,5-dihydrooxazole (3) were deter mined by X-ray crystallography and 2D-NMR spectroscopy. Complex 4 prov ed to be disordered with both diastereoisomeric complexes in the cryst al. The results of X-ray and NMR experiments demonstrate a good agreem ent between solution and solid-state equilibria of the two isomers. A comparison with o)phenyl]-4,5-dihydro-4-phenyloxazole-P,N}zinc(II) (2b ) shows a surprising conformational stability of the coordinated phosp hinooxazole ligand 3.