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Volumn 11, Issue 23, 2005, Pages 7040-7053

Hydrocarbon oxidation by β-halogenated dioxoruthenium(vi) porphyrin complexes: Effect of reduction potential (RuVI/V) and C-H bond-dissociation energy on rate constants

Author keywords

Electrochemistry; Oxidation; Porphyrinoids; Ruthenium; Structure elucidation

Indexed keywords

AXIAL LIGANDS; HYDROCARBON OXIDATION; STRUCTURE ELUCIDATION;

EID: 27944472608     PISSN: 09476539     EISSN: None     Source Type: Journal    
DOI: 10.1002/chem.200500814     Document Type: Conference Paper
Times cited : (55)

References (102)
  • 1
    • 27944499953 scopus 로고    scopus 로고
    • note
    • 3tpp = 5,10,15,20-tetrakis(2,4,6-trime-thoxyphenyl)porphyrinato(2-).
  • 20
    • 0032578899 scopus 로고    scopus 로고
    • 2tpp)Cl], respectively, as catalysts for PhIO hydrox ylation of ethylbenzene or cyclohexane (see: Z. Gross, L. Simkhovich, Tetrahedron Lett. 1998, 39, 8171).
    • (1998) Tetrahedron Lett. , vol.39 , pp. 8171
    • Gross, Z.1    Simkhovich, L.2
  • 26
    • 0001688871 scopus 로고    scopus 로고
    • (Eds.: K. M. Kadish, K. M. Smith, R. Guilard), Academic Press, San Diego, Chapter 6
    • In the case of β-chlorination or -bromination, a severe distortion of the porphyrin ligand could occur (see, for example, refs. [4] and [11]). Such porphyrin distortion is known to destabilize the HOMO of the porphyrin macrocycle, making the porphyrin ligand easier to oxidize (opposite to the inductive effect of the electron-withdrawing β-halogen substituents); however, the reduction of porphyrin ligands is little affected by the porphyrin distortion. See: a) M. O. Senge, in Porphyrin Handbook, Vol.1 (Eds.: K. M. Kadish, K. M. Smith, R. Guilard), Academic Press, San Diego, 2000, Chapter 6, p. 239;
    • (2000) Porphyrin Handbook, Vol.1 , vol.1 , pp. 239
    • Senge, M.O.1
  • 27
    • 0002347508 scopus 로고    scopus 로고
    • (Eds.: K. M. Kadish, K. M. Smith, R. Guilard), Academic Press, San Diego, Chapter 55
    • b) K. M. Kadish, E. van Camelbecke, G. Royal, in Porphyrin Handbook, Vol.8 (Eds.: K. M. Kadish, K. M. Smith, R. Guilard), Academic Press, San Diego, 2000, Chapter 55, p. 1.
    • (2000) Porphyrin Handbook, Vol.8 , vol.8 , pp. 1
    • Kadish, K.M.1    Van Camelbecke, E.2    Royal, G.3
  • 79
    • 27944465821 scopus 로고    scopus 로고
    • note
    • 2O·MeOH is surprising, since previously reported structurally characterized carbonylruthenium(II) porphyrin complexes crystallized from alcohol-containing solvents exclusively bind an alcohol molecule at an axial site (see refs [30b] and [33a]).
  • 83
    • 27944470651 scopus 로고    scopus 로고
    • note
    • II(tpp)(CO)(1-MeIm)] (1-MeIm = 1-methylimidazole) was reported to have a short C-O bond of 1.061(3) Å (ref. [35f]), coupled with a normal Fe-C(CO) bond of 1.793(3) Å.
  • 85
    • 27944501822 scopus 로고    scopus 로고
    • note
    • 2O·) distances of 3.07 Å (see ref. [40]).
  • 90
    • 27944432690 scopus 로고    scopus 로고
    • note
    • For example, the reactions of 2b,c with styrene exhibited isosbestic points at 405, 430 nm for 2b and 396, 480 nm for 2c. In the absence of pyrazole, no isosbestic points were observed.
  • 91
    • 27944496999 scopus 로고    scopus 로고
    • note
    • We found that the rate constants obtained are not dependent on the concentration of pyrazole present in the reaction mixtures. For example, varying the concentration of pyrazole within the range of 1-10% w/w did not cause appreciable change in the rate constants. In the absence of hydrocarbon substrates, the dioxo complexes 2 a-f exhibit no appreciable reaction with pyrazole under the same conditions on the time scale of the kinetic studies.


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