Oligomerization of olefins catalyzed by new cationic palladium(II) complexes containing an unsymmetrical α-diimine ligand

Organometallics

Volumn 18, Issue 15, 1999, Pages 2734-2737

  Meneghetti, Simoni Plentz ^a,b   Lutz, Pierre J ^a   Kress, Jacky ^b  

^a INSTITUT CHARLES SADRON   (France)

^b UNIVERSITÉ DE STRASBOURG   (France)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0001762183     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om990165k     Document Type: Article

References (32)

1. (a) Johnson, L. K.; Killian, C. M.; Brookhart, M. J. Am. Chem. Soc. 1995, 117, 6414.
2. (b) Mecking, S.; Johnson, L. K.; Wang, L.; Brookhart, M. J. Am. Chem. Soc. 1998, 120, 888.
3. (c) Feldman, J.; McLain, S. J.; Parthasarathy, A.; Marshall, W. J.; Calabrese, J. C.; Arthur, S. D. Organometallics 1997, 16, 1514.
4. (a) Drent, E. Pure Appl. Chem. 1990, 62, 661.
5. (b) Brookhart, M.; Rix, F. C.; DeSimone, J. M.; Barborak, J. C. J. Am. Chem. Soc. 1992, 114, 5894.
6. (c) Rix, F. C.; Brookhart, M. J. Am. Chem. Soc. 1995, 117, 1137.
7. Rülke, R. E.; Ernsting, J. M.; Spek, A. L.; Elsevier: C. J.; Van Leeuwen, P. W. N. M.; Vrieze, K. Inorg. Chem. 1993, 32, 5769.
8. Rülke, R. E.; Delis, J. G. P.; Groot, A. M.; Elsevier, C. J.; Van Leeuwen, P. W. N. M.; Vrieze, K; Goubitz, K.; Schenk, H. J. Organomet. Chem. 1996, 508, 109.
9. 6
10. 13C NMR assignments were ascertained by DEPT experiments.
11. 2) and 1.29 (CHMeMe′).
12. 2 probably has the same origin.
13. Bahr, S. R.; Boudjouk, P. J. Org. Chem. 1992, 57, 5545.
14. + could not be detected.
15. 1b
16. w = 0.084.
17. The X-ray structure determination was carried out by the Service Commun de Rayons X de la Faculté de Chimie de Strasbourg.
18. Chatt, L.; Vallarino, L. M.; Venanzi, L. M. J. Chem. Soc. 1957, 34.
19. 6,11
20. w = 0.069.
21. 1H NMR.
22. In the case of initial insertion of ethylene into palladium-hydride bonds.
23. 2n (n = 2-7) fractions.
24. 2=CH- (δ 5.81 and 4.96), cis and trans MeCH=CH- (δ 1.65, 1.60, and 5.41), and cis and trans -CH=CH- (δ 5.41). The methylene protons adjacent to these three double bonds give rise to a further signal at δ 1.98.
25. n and on the fact that each oligomer should possess almost exclusively methyl groups at both chain ends, almost no terminal carbon-carbon double bonds being detected (vide infra).
26. Except at 60°C, where up to 4% of vinyl end groups were found, or at very long reaction times.
27. The fact that the -CH=CH- bonds may occupy diverse positions in the oligomer chains certainly contributes further to the large number of isomers.
28. 2Ph groups.
29. 2n fractions of the ethylene oligomer has been proven by determining that UV detection (benzyl acrylate shows an absorption maximum at 254 nm, at which wavelength the UV detector was set) affords the same SEC trace as the refractive index detection.
30. 1H NMR resonances of both oligomers were already found for oligoethylenes.
31. Desjardin, S. Y.; Way, A. A.; Murray, M. C.; Adirim, D.; Baird, M. C. Organometallics 1998, 17, 2382.
32. 13) oligomers.