Hydrogenation of borollide-tantalum complexes: Low-valent intermediates and the effect of exocyclic substituents

Journal of the American Chemical Society

Volumn 118, Issue 42, 1996, Pages 10317-10318

  Kowal, Caroline M ^a   Bazan, Guillermo C ^a  

^a UNIVERSITY OF ROCHESTER   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ORGANOBORON DERIVATIVE;

ARTICLE; DRUG SYNTHESIS; REACTION ANALYSIS;

EID: 0029990822     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja961934j     Document Type: Article

References (15)

1. (a) Noth, H.; Schmidt, M. Angew. Chem., Int. Ed. Engl. 1996, 35, 292.
2. (b) For a survey of new ligands in metallocene complexes, see: Bochmann, M. J. Chem. Soc., Dalton Trans. 1996, 255.
3. For a recent review, see: Herberich, G. E. In Comprehensive Organometallic Chemistry II; Abel, E. W., Stone, F. G. A., Wilkinson, G., Eds.; Pergamon Press: Oxford, 1995; Vol. 1, p 197.
4. (a) Vanadium and niobium: Herberich, G. E.; Hausmann, I.; Klaff, N. Angew. Chem., Int. Ed. Engl. 1989, 28, 319.
5. (b) Zirconium and hafnium metallocenes: Quan, R. W.; Bazan, G. C.; Kiely, A. F.; Schaeffer, W. P.; Bercaw, J. E. J. Am. Chem. Soc. 1994, 116, 4489.
6. (c) Tantalum metallocenes: Bazan, G. C.; Rodriguez, G. Polyhedron 1995, 14, 93-102.
7. (d) Bazan, G. C.; Donnelly, S. J.; Rodriguez, G. J. Am. Chem. Soc. 1995, 117, 2671-2672.
8. Herberich, G. E.; Hostalek, M.; Laven, R.; Boese, R. Angew. Chem., Int. Ed. Engl. 1990, 23, 317.
9. N-B distances cover a wide range, depending on the extent of π orbital overlap. For a N-B distance of 1.557(8) Å, see: Ansorge, A.; Brauer, D. J.; Bürger, H.; Dorrenbach, F.; Hagen, T.; Pawelke, G.; Weuter, W. J. Organomet. Chem. 1991, 407, 283. A short distance of 1.371(8) Å was observed: Engelhardt, L. M.; Jacobsen, G. E.; Junk, P. C.; Raston, C. L.; White, A. H. J. Chem. Soc., Chem. Commun. 1990, 89.
10. N-B distances cover a wide range, depending on the extent of π orbital overlap. For a N-B distance of 1.557(8) Å, see: Ansorge, A.; Brauer, D. J.; Bürger, H.; Dorrenbach, F.; Hagen, T.; Pawelke, G.; Weuter, W. J. Organomet. Chem. 1991, 407, 283. A short distance of 1.371(8) Å was observed: Engelhardt, L. M.; Jacobsen, G. E.; Junk, P. C.; Raston, C. L.; White, A. H. J. Chem. Soc., Chem. Commun. 1990, 89.
11. A decrease in π orbital overlap between boron and its substituent results in a stronger boron-metal interaction and high oxidation state characteristics. For a detailed discussion, see: (a) Herberich, G. E.; Englert, U.; Hostalek, M.; Laven, R. Chem. Ber. 1991, 124, 17. (b) Ashe, A. J., III; Kampf, J. W.; Müller, C.; Schneider, M. Organometallics 1996, 15, 387.
12. A decrease in π orbital overlap between boron and its substituent results in a stronger boron-metal interaction and high oxidation state characteristics. For a detailed discussion, see: (a) Herberich, G. E.; Englert, U.; Hostalek, M.; Laven, R. Chem. Ber. 1991, 124, 17. (b) Ashe, A. J., III; Kampf, J. W.; Müller, C.; Schneider, M. Organometallics 1996, 15, 387.
13. (a) Miller, F. D.; Sanner, R. D. Organometallics 1988, 7, 818.
14. (b) Lin, Z.; Marks, T. J. J. Am. Chem. Soc. 1987, 109, 7979.
15. (c) Jordan, R. F.; Bajgur, C. S.; Dasher, W. E.; Rheingold, A. L. Organometallics 1987, 6, 1041.