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Volumn 127, Issue 18, 2005, Pages 6883-6892

Photochemistry of an azido-functionalized cryptand: Controlling the reactivity of an extremely long-lived singlet aryl nitrene by complexation to alkali cations

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION; ACETONITRILE; AMINES; COMPLEXATION; DERIVATIVES; LASER APPLICATIONS; PHOTOLYSIS; POSITIVE IONS; POTASSIUM; QUANTUM THEORY; SODIUM; SOLUTIONS; SUBSTITUTION REACTIONS; ULTRAVIOLET SPECTROSCOPY;

EID: 18644378491     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja0447208     Document Type: Article
Times cited : (14)

References (56)
  • 2
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    • D. H. Volman, G. Hammond, D. C. Neckers, Eds.; John Wiley & Sons: New York
    • Schuster, G. B.; Platz, M. S. In Advances in Photochemistry; D. H. Volman, G. Hammond, D. C. Neckers, Eds.; John Wiley & Sons: New York, 1992; pp 69-143.
    • (1992) Advances in Photochemistry , pp. 69-143
    • Schuster, G.B.1    Platz, M.S.2
  • 3
    • 84875507802 scopus 로고    scopus 로고
    • Photochemical Reactivity of Azides
    • CRC Press: Boca Raton, Chapter 44
    • (a) Bucher, G. Photochemical Reactivity of Azides. In CRC Handbook of Photochemistry, 2nd ed.; CRC Press: Boca Raton, 2003; Chapter 44.
    • (2003) CRC Handbook of Photochemistry, 2nd Ed.
    • Bucher, G.1
  • 4
    • 22144491705 scopus 로고    scopus 로고
    • Nitrenes
    • Wiley-Interscience: Hoboken, Chapter 11
    • (b) Platz, M. S. Nitrenes. In Reactive Intermediate Chemistry; Wiley-Interscience: Hoboken, 2004; Chapter 11.
    • (2004) Reactive Intermediate Chemistry
    • Platz, M.S.1
  • 5
    • 4544256467 scopus 로고    scopus 로고
    • Synthetic Carbene and Nitrene Chemistry
    • Wiley Interscience: Hoboken, Chapter 12
    • (c) Doyle, M. P. Synthetic Carbene and Nitrene Chemistry. In Reactive Intermediate Chemistry; Wiley Interscience: Hoboken, 2004; Chapter 12.
    • (2004) Reactive Intermediate Chemistry
    • Doyle, M.P.1
  • 25
    • 18644364364 scopus 로고    scopus 로고
    • B3LYP/6-31G(d)
    • B3LYP/6-31G(d).
  • 26
    • 18644367709 scopus 로고    scopus 로고
    • note
    • exo-Attack, formation of the 2-cyanotetrahydroquinoline derivative. Simpler iminoquinone methides, as described in ref 14, are considerably more reactive toward dienophiles. The reason for the significantly reduced reactivity of Z-9 is unclear at present. Most likely, steric factors play a role.
  • 28
    • 18644372572 scopus 로고    scopus 로고
    • note
    • (b) The signals at -3400 G are narrow triplets, which are assigned to aminyl/alkyl radical pairs formed by intramolecular hydrogen abstraction by the nitrene from a crown ether methylene group.
  • 29
    • 18644372700 scopus 로고    scopus 로고
    • note
    • +.
  • 30
    • 18644386458 scopus 로고    scopus 로고
    • note
    • 32 must be destabilized by the electron-rich environment, or else the didehydroazepine 7 stabilized, or both.
  • 39
    • 18644367837 scopus 로고    scopus 로고
    • note
    • 12 and 11 can thus be estimated as 23 kcal/mol.
  • 45
    • 18644379727 scopus 로고    scopus 로고
    • note
    • (a) We cannot rule out formation of 13 from higher excited singlet states of either 1 or 2.
  • 46
    • 18644378425 scopus 로고    scopus 로고
    • note
    • + resulted in cleavage of the N-O bond and convergence to a nitrene structure.
  • 51
    • 18644364240 scopus 로고    scopus 로고
    • note
    • max = 511, 447, and 411 nm.
  • 55
    • 18644372045 scopus 로고    scopus 로고
    • cf. ref 17 and references therein
    • 12 by diethylamine also partially accounts for our failure to isolate 5 upon photolysis of complexes of 1 in the presence of diethylamine (Stern-Volmer quenching). In addition, complexes of 5 may also simply be too unstable for isolation (cf. ref 17 and references therein).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.