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Volumn 130, Issue 6, 2008, Pages 2051-2061

Carbon-carbon bond activation of 2,2,6,6-tetramethyl-piperidine-1-oxyl by a RhII metalloradical: A combined experimental and theoretical study

Author keywords

[No Author keywords available]

Indexed keywords

BOND ACTIVATION; ELECTRON TRANSFER; IONIC PATHWAY; NUCLEOPHILIC SUBSTITUTION ATTACK;

EID: 39049109813     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja078157f     Document Type: Article
Times cited : (68)

References (86)
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    • (c) A derivative of azaoxetane 7 has been a proposed, unstable intermediate: Baldwin, J. E.; Bhatnagar, A. K.; Choi, S. C.; Shortridge, T. J. J. Am. Chem. Soc. 1971, 93, 4082-4084.
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    • This is understandable, because the energy of the TEMPOH O-H bond is only 70 kcal/mol and thus not strong enough to allow hydrogen atom transfer from the much stronger alkyl C-H bonds of TEMPO or benzene Me3CCH 2-H, 100 kcal/mol, Ph-H, 113 kcal/mol, See: Luo, Y.-R. Handbook of Bond Dissociation Energies in Organic Compounds; CRC Press: Boca Raton, FL, 2003
    • 2-H = 100 kcal/mol, Ph-H = 113 kcal/mol). See: Luo, Y.-R. Handbook of Bond Dissociation Energies in Organic Compounds; CRC Press: Boca Raton, FL, 2003.
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    • In case of rate limiting steps following formation of species 8′, K2 must be relatively small (< 1) so to make K1K2[TEMPO] ≪ 1, thus simplifying the individual rate equations rate, knK1K2[TEMPO][Rh(tmp)]0, 1, K1K2[TEMPO, to rate, kobs[T][Rh(tmp)]0 with kobs, knK1K 2 and n, 3 or 4
    • 2 and n = 3 or 4).
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    • Electron transfer from TEMPO to [RhII(por, formation of III, Scheme 4) is noteworthy, RhII(por, species and nitroxyl radicals are both redox active and both have the ability to act as reducing and as oxidizing agents. The reverse SET direction (from Rh to TEMPO) seems applicable in the formation of the TEMPO adduct [RhIIIpor, TEMPO, II. Hypothetical outer-sphere ET from [RhII(tmp, to TEMPO would yield a [RhIII(por, TEMPO, cation-anion pair. This is perhaps possible in polar solvents, but in the gas-phase or in benzene it would easily collapse to form the [Rh(por)(TEMPO, adduct II. In previous reports, we have already shown that the methyl transfer reaction cannot proceed via reaction of neutral nitroxyl radicals with [RhIII(por, cations or [Rh Ipor, anions.10b
    • 10b
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    • This is not the first time that hybrid HF/DFT functional (such as b3-lyp) are found to overestimate the relative stability of radicals compared to closed-shell systems: (a) Saeys, M, Reyniers, M.-F, Marin, G. B, Van Speybroeck, V, Waroquir, J. Phys. Chem. A 2003, 107, 9147-9159
    • This is not the first time that hybrid HF/DFT functional (such as b3-lyp) are found to overestimate the relative stability of radicals compared to closed-shell systems: (a) Saeys, M.; Reyniers, M.-F.; Marin, G. B.; Van Speybroeck, V.; Waroquir, J. Phys. Chem. A 2003, 107, 9147-9159.
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    • Turbomole, version 5, Turbomole basisset library see ref 25a
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    • PQS, version 2.4; Parallel Quantum Solutions: Fayetteville, AR, 2001 the Baker optimizer is available separately from PQS upon request
    • (a) PQS, version 2.4; Parallel Quantum Solutions: Fayetteville, AR, 2001 (the Baker optimizer is available separately from PQS upon request),
  • 82
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    • Calculations were performed using the Turbomole functional b3-lyp, which is not identical to the Gaussian B3LYP functional.
    • (d) Calculations were performed using the Turbomole functional "b3-lyp", which is not identical to the Gaussian "B3LYP" functional.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.