Asymmetric synthesis of a chiral tetradentate ligand based on a bis[diphenylphosphinoferrocenyl] moiety. Electrochemical behavior of free ligand and its ruii and cui complexes

Journal of Organometallic Chemistry

Volumn 511, Issue 1-2, 1996, Pages 193-197

  Masson Szymczak, Anne ^a   Riant, Olivier ^a   Gref, Aurore ^a   Kagan, Henri B ^a  

^a UNIVERSITÉ PARIS SUD   (France)

Author keywords

Asymmetric synthesis; Copper; Cyclic voltammetry; Ferrocenyl phosphine; Ruthenium; Tetradentate ligand

Indexed keywords

EID: 0030570008     PISSN: 0022328X     EISSN: None     Source Type: Journal    
DOI: 10.1016/0022-328X(95)05968-U     Document Type: Article

References (14)

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3. +0) formation, which can evolve in the presence of traces of water, and subsequent oxidation to phosphine oxide
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7. +.
8. I are four-or three-coordinated by the two phosphino groups and one of the two imino groups, a fast equilibrium occuring between the two imino groups. The electrochemical data of our ferrocenyl analogue 8 do not fit with this picture and are better accommodated with a tricoordinate complexation involving a fast equilibrium between the two phosphino groups. More work is needed to confirm this interpretation, the different behavior probably originating from steric and electronic factors not present in the benzene analog.
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12. 2-symmetric bis-imine ligands have been successfully used as chiral ligands in asymmetric catalysis. See for instance: (a) Z. Li, K.R. Conser and E.N. Jacobsen, J. Am. Chem. Soc., 115 (1993) 5326.
13. (b) D.A. Evans, T. Lectka and S.J. Miller, Tetrahedron Lett., 34 (1993) 7027.
14. (c) J. Knol, A. Meetsma and B.L. Feringa, Tetrahedron: Asymmetry, 6 (1995) 1069.