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Volumn 137, Issue 20, 2015, Pages 6440-6443

Bond-Weakening Catalysis: Conjugate Aminations Enabled by the Soft Homolysis of Strong N-H Bonds

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSIS; COORDINATION REACTIONS; ELECTRON TRANSPORT PROPERTIES; METALS; REDOX REACTIONS;

EID: 84930226954     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/jacs.5b03428     Document Type: Article
Times cited : (90)

References (57)
  • 37
    • 84930238244 scopus 로고    scopus 로고
    • note
    • Reference 4b.
  • 46
    • 84930238245 scopus 로고    scopus 로고
    • note
    • The orbital origin of the transferring electron in these bond activations (from titanium or localized in the N-H σ bond) is not clear. We favor concerted PCET as the mechanism based on prior work (including refs 6a-6d) but acknowledge that HAT cannot be discounted.
  • 47
    • 84930238246 scopus 로고    scopus 로고
    • note
    • Alternatively, direct HAT from TEMPO-H to the Ti(IV) enolate in Scheme 1 is calculated to be favorable by 14 kcal/mol and is a plausible alternative mechanism for regeneration of the Ti(III) catalyst and TEMPO. See Supporting Information (SI) for details.
  • 48
    • 84930238247 scopus 로고    scopus 로고
    • note
    • A reviewer suggested that thermal homolysis of the Ti-O bond in the Ti(IV) enolate followed by the HAT from TEMPO-H to the α-carbonyl free radical as a possible alternative mechanism.
  • 53
    • 84930238248 scopus 로고    scopus 로고
    • note
    • 3, a non-redox-active Lewis acid, is calculated to be 99 kcal/mol.
  • 54
    • 84930238249 scopus 로고    scopus 로고
    • note
    • All thermochemical parameters were also calculated using the LANL2DZ functional, with very similar results. See SI.
  • 55
    • 84930238250 scopus 로고    scopus 로고
    • note
    • See SI for details.
  • 56
    • 84930238251 scopus 로고    scopus 로고
    • note
    • Calculations indicate that amide binding is endergonic by ∼10 kcal/mol. See SI.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.