Synthesis,and Solution and Solid-State Structures of (η3-Allyl){(4S)-4-benzyl-2-[2′-(diphenylphosphino)phenyl]- 4,5-dihydrooxazole-P,N}palladium(II) Hexafluorophosphates. Comparison with Dichloro{(4S)-2-[2′-(diphenylphosphino)phenyl]-4,5-dihydro-4-phenyloxazole-P,N}zinc(II)

Crystal and solution structures of the Pd^II(η³-allyl)] and of the Pd^II(η³-1,3-diphenylallyl)] complexes, 4 and 5 , respectively, with (4S)-4-benzyl-2-2′-(diphenylphosphino)phenyl]-4,5-dihydrooxazole ( 3 ) were determined by X-ray crystallography and 2D-NMR spectroscopy. Complex 4 proved to be disordered with both diastereoisomeric complexes in the crystal. The results of X-ray and NMR experiments demonstrate a good agreement between solution and solid-state equilibria of the two isomers. A comparison with dichloro{(4S)-2-2′-(diphenylphosphino)phenyl]-4,5-dihydro-4-phenyloxazole-P,N}zinc(II) ( 2b ) shows a surprising conformational stability of the coordinated phosphinooxazole ligand 3 .