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Volumn 137, Issue 18, 2015, Pages 5867-5870

Direct Hydroxylation of Benzene to Phenol Using Hydrogen Peroxide Catalyzed by Nickel Complexes Supported by Pyridylalkylamine Ligands

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSTS; HYDROXYLATION; ISOTOPES; NICKEL; PHENOLS;

EID: 84929376720     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/jacs.5b01814     Document Type: Article
Times cited : (158)

References (53)
  • 32
    • 84929381495 scopus 로고    scopus 로고
    • note
    • The conversion of benzene was not identical to the yield because of evaporation of benzene (∼10% in 5 h). This was confirmed by a blank experiment.
  • 33
    • 84929381496 scopus 로고    scopus 로고
    • note
    • A large part of the H2O2 (44%) remained after the reaction.
  • 34
    • 84929381497 scopus 로고    scopus 로고
    • note
    • For catalyst 3, we observed ligand hydroxylation at the benzylic position of the phenethyl arm in about 10% yield by 1H NMR analysis, whereas we did not detect such a ligand-hydroxylated product with catalyst 2. For details, see the SI.
  • 37
    • 84929381498 scopus 로고    scopus 로고
    • note
    • The concentrations of benzene, H2O2, and TEA were optimized (see Table S2).
  • 38
    • 84929381499 scopus 로고    scopus 로고
    • note
    • After the reaction, 4.3 mmol of H2O2 (17% of the initial amount) remained.
  • 41
    • 84929381500 scopus 로고    scopus 로고
    • note
    • In aromatic oxygenation reactions, a shift of the deuteron on the attacked carbon to the neighboring carbon (a so-called NIH shift) is often observed. In this system, however, the NIH shift was not observed in the oxygenation reaction of toluene-4- d 1. For details, see Scheme S4.
  • 45
    • 84929381501 scopus 로고    scopus 로고
    • note
    • Unfortunately, we could not detect any spectral change upon addition of H2O2 to a solution of catalyst 2 at low temperature (below -60 C), under which conditions catalyst 3, supported by the less hindered bepa ligand, generates a dinickel(III) bis(μ-oxo) species (see ref 30).
  • 51
    • 84929381502 scopus 로고    scopus 로고
    • note
    • 14-tmc has also been reported to be able to stabilize dinickel(II) peroxide species generated by the reaction between the corresponding Ni(I) complex and molecular oxygen (see ref 52).
  • 53
    • 84929381503 scopus 로고    scopus 로고
    • note
    • The oxygenation efficiency of benzene derivatives with catalyst 2 was found to decrease upon the introduction of electron-donating substituents. This unusual selectivity of benzene oxygenation over phenol oxygenation may be due to this tendency.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.