Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.ica.2004.06.003
Title: The naphthylamine palladium(II) template induced E-Z isomerism of exocyclic vinyl group in five-membered P-N chelates: Detailed spectroscopic studies
Authors: Liu, X.
Selvaratnam, S.
Mok, K.F. 
Leung, P.-H. 
Keywords: 2D ROESY NMR spectroscopy
E-Z Isomerism
Imino-phosphine
Organopalladium complexes
Issue Date: 15-Nov-2004
Citation: Liu, X., Selvaratnam, S., Mok, K.F., Leung, P.-H. (2004-11-15). The naphthylamine palladium(II) template induced E-Z isomerism of exocyclic vinyl group in five-membered P-N chelates: Detailed spectroscopic studies. Inorganica Chimica Acta 357 (14) : 4279-4285. ScholarBank@NUS Repository. https://doi.org/10.1016/j.ica.2004.06.003
Abstract: The exocyclic C=C bond E-Z isomerism of chelating Ph2PC(=CHPh)- CH=NAr in organopalladium complexes containing orthometallated [(S)-1-(dimethylamino)ethyl]naphthalene is reported. In dilute solutions of non-coordinating CH2Cl2 or CHCl3, all the original E-isomers, in which the =CHPh phenyl rings are located trans to PPh2 moieties were partly converted to their Z-isomers. The isomerism was found to be dependent on temperature, concentration and solvent. At higher temperature, the Z-isomers were transformed completely back to their original E-isomers. Removal of the chiral auxiliaries of the E-Z mixtures by concentrated HCl, gave only the dichloro complexes of the E-isomers. The E-Z isomerization processes were well established by detailed spectroscopic studies, including 31P NMR, 1H NMR and 2D 1H-1H ROESY NMR studies. It is noteworthy that the dichloro complexes and free P-N ligands did not show such isomerization processes, indicating that the isomerization processes were triggered by the orthopalladated naphthylamine moiety. © 2004 Elsevier B.V. All rights reserved.
Source Title: Inorganica Chimica Acta
URI: http://scholarbank.nus.edu.sg/handle/10635/95243
ISSN: 00201693
DOI: 10.1016/j.ica.2004.06.003
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