The first chiral early-late heterobimetallic complex - A titanium(IV)-palladium(II) complex based on salenophos

Tetrahedron

Volumn 52, Issue 46, 1996, Pages 14599-14606

  Kless, Achim ^a   Lefeber, Claudia ^a   Spannenberg, Anke ^a   Kempe, Rhett ^a   Baumann, Wolfgang ^a   Holz, Jens ^a   Börner, Armin ^a  

^a UNIVERSITY OF ROSTOCK   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

CHELATING AGENT; METAL COMPLEX; PALLADIUM COMPLEX; SALENOPHOS; TITANIUM; UNCLASSIFIED DRUG;

ARTICLE; COMPLEX FORMATION; DRUG STRUCTURE; DRUG SYNTHESIS; NUCLEAR MAGNETIC RESONANCE; PRIORITY JOURNAL; X RAY ANALYSIS;

EID: 0344126387     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/0040-4020(96)00864-2     Document Type: Article

References (31)

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12. 5 Reactions of chiral metallocene(Fe, Cr, Re)-heterobimetallic complexes should be also mentioned. However due to their structure and composition one of the metals could not play an active role in the reaction investigated : a) [Fe]: Hayashi, T. in Ferrocenes (Eds.: Togni, A.; Hayashi, T.), VCH, Weinheim, 1995, 105-142;
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16. 6 For this combination the abbreviation ELHB was suggested: Stephan, D. W. Coord. Chem. Rev. 1989, 95, 41-107.
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19. 8 See also the approach to introduce the Lewis-acid boron in a chiral rhodium complex: a) Börner, A.; Ward, J.; Kortus, K.; Kagan, H. B. Tetrahedron: Asymmetry 1993, 4, 2219-2228;
20. b) Fields. L. B.; Jacobsen, E. N. ibid. 1993, 4, 2229-2240.
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25. 11 Recently, the synthesis of achiral salenophos-type ligands was also described by the group of Chan: a) Lam, F.; Chan, K. S.; Liu, B.-J. Tetrahedron Lett. 1995, 36, 6261-6262;
26. b) Lam, F.; Chan, K. S. ibid. 1995, 36, 919-922.
27. 12 For the reaction of chiral hydroxyalkyl phosphines with rhodium(I) see: Börner, A.; Kless, A.; Holz, J.; Baumann, W.; Tillack, A.; Kadyrov, R. J. Organomet. Chem. 1995, 490, 213-219.
28. 13 It is noteworthy that o-phosphinephenols may react with Ti(IV) to give O-P-chelates (Willoughby; C. A.; Duff Jr., R. R.; Davis, W. M.; Buchwald, S. L. Organometallics 1996, 15, 472-475). Obviously, in salenophos this type of chelation is prevented by the successful competition of the two nitrogen atoms.
29. 14 Lefeber, C.; Ohff, A.; Tillack, A.; Baumann, W.; Kempe, R.; Burlakov, V. V.; Rosenthal, U.; Görls, H. J. Organomet. Chem. 1995, 501, 179-188.
30. 2 (all data) = 0.119, 807 parameters. Atomic coordinates, bond lengths and angles, and thermal parameters have been deposited at Cambridge Crystallographic Data Centre. Copies of the data can be obtained from: The Director, CCDC, 12 Union Road, GB-Cambridge CB21EZ (Telefax: Int. + 12 23/3 36 0 33; E-mail: teched@chemcrys.cam.ac.uk). A coloured picture of the X-ray structure can be regarded in http://www.chemiel.uni-rostock.de.
31. 16 For related trans coordinated chiral ferrocenyl bisphosphine-Pd complexes see: Sawamura, M.; Hamashima, H.; Sugawara, M; Kuwano, R.; Ito, Y. Organometallics 1995, 14, 4549-4558 and ref. cited therein.