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Volumn 125, Issue 28, 2003, Pages 8614-8624

Reductive elimination/oxidative addition of carbon-hydrogen bonds at Pt(IV)/Pt(II) centers: Mechanistic studies of the solution thermolyses of TpMe2Pt(CH3)2H

Author keywords

[No Author keywords available]

Indexed keywords

ADDITION REACTIONS; ENTHALPY; OXIDATION; PLATINUM; REACTION KINETICS;

EID: 0037699430     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja028477t     Document Type: Article
Times cited : (105)

References (96)
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    • 1′ by the start of the data collection shown in Figure 5. This scrambling occurs during sample preparation and the time required for temperature stabilization in the heated NMR probe.
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    • note
    • eq + 1) is near unity.
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    • While it is possible to obtain an inverse kinetic isotope effect in a single reaction step, a more reasonable explanation is a two-step mechanism whereby the observed isotope effect is then a product of the equilibrium isotope effect between the starting and intermediate complexes and the kinetic isotope effect of a rate-determining second step. In this way, an inverse equilibrium isotope effect can dominate in the kinetic isotope effect measured for the overall reductive elimination reaction. An alkane σ-complex is an ideal intermediate in this context; the significantly greater strength of the methane carbon-hydrogen bond in the σ-alkane complex, relative to the metal-hydrogen bond in the starting complex, leads to the requisite inverse equilibrium isotope effect. Note that kinetic isotope effects of the forward and reverse reactions of this preequilibrium between the alkyl hydride complex and the σ-alkane complex can both be normal. Loss of the alkane from the σ-complex in the second and rate-determining step of reductive elimination should not have a significant effect on the C-H bond. so only a small, primary kinetic isotope effect is expected.
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    • For some examples with Pt(II)/Pt(IV) see: (a) Siegbahn, P. E. M.; Crabtree, R. H. J. Am. Chem. Soc. 1996, 118, 4442. (b) Hill, G. S.; Puddephatt, R. J. Organometallics 1998, 17, 1478. (c) Heiberg, H.; Swang, O.; Ryan, O. B.; Gropen, O. J. Phys. Chem. A 1999, 103, 10004. (d) Bartlett, K. L.; Goldberg, K. I.; Borden, W. T. J. Am. Chem. Soc. 2000, 122, 1456. (e) Mylvaganam, K.; Bacskay, G. B.; Hush, N. S. J. Am. Chem. Soc. 2000, 122, 2041. (f) Heiberg, H.; Johansson, L.: Gropen, O.; Ryan, O. B.; Swang, O.; Tilset, M. J. Am. Chem. Soc. 2000, 122, 10831. (g) Gilbert, T. M.; Hristov, I.; Ziegler, T. Organometallics 2001, 20, 1183. (h) Bartlett, K. L.; Goldberg, K. I.: Borden, W. T. Organometallics 2001, 20, 2669. (i) Kua, J.: Xu, X.; Periana, R. A.; Goddard, W. A., III. Organometallics 2002, 21, 511. (j) Ref 27b.
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    • For some examples with Pt(II)/Pt(IV) see: (a) Siegbahn, P. E. M.; Crabtree, R. H. J. Am. Chem. Soc. 1996, 118, 4442. (b) Hill, G. S.; Puddephatt, R. J. Organometallics 1998, 17, 1478. (c) Heiberg, H.; Swang, O.; Ryan, O. B.; Gropen, O. J. Phys. Chem. A 1999, 103, 10004. (d) Bartlett, K. L.; Goldberg, K. I.; Borden, W. T. J. Am. Chem. Soc. 2000, 122, 1456. (e) Mylvaganam, K.; Bacskay, G. B.; Hush, N. S. J. Am. Chem. Soc. 2000, 122, 2041. (f) Heiberg, H.; Johansson, L.: Gropen, O.; Ryan, O. B.; Swang, O.; Tilset, M. J. Am. Chem. Soc. 2000, 122, 10831. (g) Gilbert, T. M.; Hristov, I.; Ziegler, T. Organometallics 2001, 20, 1183. (h) Bartlett, K. L.; Goldberg, K. I.: Borden, W. T. Organometallics 2001, 20, 2669. (i) Kua, J.: Xu, X.; Periana, R. A.; Goddard, W. A., III. Organometallics 2002, 21, 511. (j) Ref 27b.
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    • Bartlett, K.L.1    Goldberg, K.I.2    Borden, W.T.3
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    • For some examples with Pt(II)/Pt(IV) see: (a) Siegbahn, P. E. M.; Crabtree, R. H. J. Am. Chem. Soc. 1996, 118, 4442. (b) Hill, G. S.; Puddephatt, R. J. Organometallics 1998, 17, 1478. (c) Heiberg, H.; Swang, O.; Ryan, O. B.; Gropen, O. J. Phys. Chem. A 1999, 103, 10004. (d) Bartlett, K. L.; Goldberg, K. I.; Borden, W. T. J. Am. Chem. Soc. 2000, 122, 1456. (e) Mylvaganam, K.; Bacskay, G. B.; Hush, N. S. J. Am. Chem. Soc. 2000, 122, 2041. (f) Heiberg, H.; Johansson, L.: Gropen, O.; Ryan, O. B.; Swang, O.; Tilset, M. J. Am. Chem. Soc. 2000, 122, 10831. (g) Gilbert, T. M.; Hristov, I.; Ziegler, T. Organometallics 2001, 20, 1183. (h) Bartlett, K. L.; Goldberg, K. I.: Borden, W. T. Organometallics 2001, 20, 2669. (i) Kua, J.: Xu, X.; Periana, R. A.; Goddard, W. A., III. Organometallics 2002, 21, 511. (j) Ref 27b.
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    • Mylvaganam, K.1    Bacskay, G.B.2    Hush, N.S.3
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    • For some examples with Pt(II)/Pt(IV) see: (a) Siegbahn, P. E. M.; Crabtree, R. H. J. Am. Chem. Soc. 1996, 118, 4442. (b) Hill, G. S.; Puddephatt, R. J. Organometallics 1998, 17, 1478. (c) Heiberg, H.; Swang, O.; Ryan, O. B.; Gropen, O. J. Phys. Chem. A 1999, 103, 10004. (d) Bartlett, K. L.; Goldberg, K. I.; Borden, W. T. J. Am. Chem. Soc. 2000, 122, 1456. (e) Mylvaganam, K.; Bacskay, G. B.; Hush, N. S. J. Am. Chem. Soc. 2000, 122, 2041. (f) Heiberg, H.; Johansson, L.: Gropen, O.; Ryan, O. B.; Swang, O.; Tilset, M. J. Am. Chem. Soc. 2000, 122, 10831. (g) Gilbert, T. M.; Hristov, I.; Ziegler, T. Organometallics 2001, 20, 1183. (h) Bartlett, K. L.; Goldberg, K. I.: Borden, W. T. Organometallics 2001, 20, 2669. (i) Kua, J.: Xu, X.; Periana, R. A.; Goddard, W. A., III. Organometallics 2002, 21, 511. (j) Ref 27b.
    • (2000) J. Am. Chem. Soc. , vol.122 , pp. 10831
    • Heiberg, H.1    Johansson, L.2    Gropen, O.3    Ryan, O.B.4    Swang, O.5    Tilset, M.6
  • 83
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    • For some examples with Pt(II)/Pt(IV) see: (a) Siegbahn, P. E. M.; Crabtree, R. H. J. Am. Chem. Soc. 1996, 118, 4442. (b) Hill, G. S.; Puddephatt, R. J. Organometallics 1998, 17, 1478. (c) Heiberg, H.; Swang, O.; Ryan, O. B.; Gropen, O. J. Phys. Chem. A 1999, 103, 10004. (d) Bartlett, K. L.; Goldberg, K. I.; Borden, W. T. J. Am. Chem. Soc. 2000, 122, 1456. (e) Mylvaganam, K.; Bacskay, G. B.; Hush, N. S. J. Am. Chem. Soc. 2000, 122, 2041. (f) Heiberg, H.; Johansson, L.: Gropen, O.; Ryan, O. B.; Swang, O.; Tilset, M. J. Am. Chem. Soc. 2000, 122, 10831. (g) Gilbert, T. M.; Hristov, I.; Ziegler, T. Organometallics 2001, 20, 1183. (h) Bartlett, K. L.; Goldberg, K. I.: Borden, W. T. Organometallics 2001, 20, 2669. (i) Kua, J.: Xu, X.; Periana, R. A.; Goddard, W. A., III. Organometallics 2002, 21, 511. (j) Ref 27b.
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    • Gilbert, T.M.1    Hristov, I.2    Ziegler, T.3
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    • For some examples with Pt(II)/Pt(IV) see: (a) Siegbahn, P. E. M.; Crabtree, R. H. J. Am. Chem. Soc. 1996, 118, 4442. (b) Hill, G. S.; Puddephatt, R. J. Organometallics 1998, 17, 1478. (c) Heiberg, H.; Swang, O.; Ryan, O. B.; Gropen, O. J. Phys. Chem. A 1999, 103, 10004. (d) Bartlett, K. L.; Goldberg, K. I.; Borden, W. T. J. Am. Chem. Soc. 2000, 122, 1456. (e) Mylvaganam, K.; Bacskay, G. B.; Hush, N. S. J. Am. Chem. Soc. 2000, 122, 2041. (f) Heiberg, H.; Johansson, L.: Gropen, O.; Ryan, O. B.; Swang, O.; Tilset, M. J. Am. Chem. Soc. 2000, 122, 10831. (g) Gilbert, T. M.; Hristov, I.; Ziegler, T. Organometallics 2001, 20, 1183. (h) Bartlett, K. L.; Goldberg, K. I.: Borden, W. T. Organometallics 2001, 20, 2669. (i) Kua, J.: Xu, X.; Periana, R. A.; Goddard, W. A., III. Organometallics 2002, 21, 511. (j) Ref 27b.
    • (2001) Organometallics , vol.20 , pp. 2669
    • Bartlett, K.L.1    Goldberg, K.I.2    Borden, W.T.3
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    • For some examples with Pt(II)/Pt(IV) see: (a) Siegbahn, P. E. M.; Crabtree, R. H. J. Am. Chem. Soc. 1996, 118, 4442. (b) Hill, G. S.; Puddephatt, R. J. Organometallics 1998, 17, 1478. (c) Heiberg, H.; Swang, O.; Ryan, O. B.; Gropen, O. J. Phys. Chem. A 1999, 103, 10004. (d) Bartlett, K. L.; Goldberg, K. I.; Borden, W. T. J. Am. Chem. Soc. 2000, 122, 1456. (e) Mylvaganam, K.; Bacskay, G. B.; Hush, N. S. J. Am. Chem. Soc. 2000, 122, 2041. (f) Heiberg, H.; Johansson, L.: Gropen, O.; Ryan, O. B.; Swang, O.; Tilset, M. J. Am. Chem. Soc. 2000, 122, 10831. (g) Gilbert, T. M.; Hristov, I.; Ziegler, T. Organometallics 2001, 20, 1183. (h) Bartlett, K. L.; Goldberg, K. I.: Borden, W. T. Organometallics 2001, 20, 2669. (i) Kua, J.: Xu, X.; Periana, R. A.; Goddard, W. A., III. Organometallics 2002, 21, 511. (j) Ref 27b.
    • (2002) Organometallics , vol.21 , pp. 511
    • Kua, J.1    Xu, X.2    Periana, R.A.3    Goddard W.A. III4
  • 86
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    • Ref 27b
    • For some examples with Pt(II)/Pt(IV) see: (a) Siegbahn, P. E. M.; Crabtree, R. H. J. Am. Chem. Soc. 1996, 118, 4442. (b) Hill, G. S.; Puddephatt, R. J. Organometallics 1998, 17, 1478. (c) Heiberg, H.; Swang, O.; Ryan, O. B.; Gropen, O. J. Phys. Chem. A 1999, 103, 10004. (d) Bartlett, K. L.; Goldberg, K. I.; Borden, W. T. J. Am. Chem. Soc. 2000, 122, 1456. (e) Mylvaganam, K.; Bacskay, G. B.; Hush, N. S. J. Am. Chem. Soc. 2000, 122, 2041. (f) Heiberg, H.; Johansson, L.: Gropen, O.; Ryan, O. B.; Swang, O.; Tilset, M. J. Am. Chem. Soc. 2000, 122, 10831. (g) Gilbert, T. M.; Hristov, I.; Ziegler, T. Organometallics 2001, 20, 1183. (h) Bartlett, K. L.; Goldberg, K. I.: Borden, W. T. Organometallics 2001, 20, 2669. (i) Kua, J.: Xu, X.; Periana, R. A.; Goddard, W. A., III. Organometallics 2002, 21, 511. (j) Ref 27b.
  • 94
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    • note
    • A reviewer has suggested that the data could also be accommodated by an associative methane substitution pathway if the rate-limiting step is actually a ligand isomerization that provides steric access to the Pt center. This possibility cannot be excluded, but it should be noted that this isomerization must require more energy than dissociation of methane from the metal center.
  • 95
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    • note
    • 3) fragment.


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