SELECTIVE RESTRICTED PHENYL ROTATION IN AN ETA(3)-PH(2)C--CH--CHPH ALLYL SPARTEINE COMPLEX OF PD(II) - VARIABLE-TEMPERATURE C-13 AND MULTINUCLEAR EXCHANGE SPECTROSCOPY

Variable-temperature studies in addition to 2D exchange and NOE measurements on the chiral allyl complex [Pd(eta(3)-Ph(2)C-CH-CHPh){(-)-sparteine}][PF6] have revealed that there is restricted rotation about the ipso-C-allyl-C bonds for the three Ph groups of the eta(3)-Ph(2)C-CH-CHPh ligand, with that for the anti Ph group having a much higher activation energy. Possible consequences for the reaction chemistry of 1,1-diphenylallyl complexes due to the dose proximity of this anti Ph to the chiral bidentate nitrogen ligand are discussed. Detailed C-13 and H-1 assignments, based on NOESY, TOCSY and C,H correlation measurements, are given.