• Title/Summary/Keyword: 3,5-Di-tert-butyl-1,2-benzoquinone

Search Result 2, Processing Time 0.015 seconds

Saturated- and Unsaturated-Azamacrocyclic Complexes $(M = Co^{3+}, Fe^{3+}$ or $Mn^{3+})$ Catalyzed Oxidation of Hindered Phenols by Molecular Oxygen under Sodium Borohydride (Sodium Borohydride 하에서 산소에 의한 포화- 및 불포화-질소주게 거대고리 착물 $(M=Co^{3+},\;Fe^{3+}$ 및 $Mn^{3+})$을 촉매로 한 Hindered Phenols의 산화반응)

  • Yu-Chul Park;Seong-Su Kim;Hun-Gil Na
    • Journal of the Korean Chemical Society
    • /
    • v.37 no.7
    • /
    • pp.648-654
    • /
    • 1993

  • $[M(cyclam)X_2]Y(M=Co^{3+},\;Fe^{3+},\;Mn^{3+}\;:\;X=Cl-^,\;Br^-,\;NCS^-\;:\;Y=Cl^-,\;Br^-,\;NCS^-),\;[Co(trans-14-diene)X_2]Y(X=Cl^-,\;Br^-\;:\;Y=ClO_4^-)\;and\;[Co(trans-14-diene)](ClO_4)_2$ were able to activate an molecular oxygen under sodium borohydride. 2,4-di-tert-butylphenol and 2,6-di-tert-butylphenol reacted with activated molecular oxygen to give 2,4-tert-butyl-1,6-benzoquinone(BQ) and 3,5,3',5'-tetra-tert-butyldiphenoquinone(DPQ). The saturated tetraazamacrocyclic complexes, $[Co(cyclam)X_2]Y$, were more an effective catalyst than $[Co(trans-14-diene)X_2]Y$ the unsaturated complexes in the formation of BQ and DPQ. The mole ratio of $O_2$ vs. catalyst $(O_2/M)$ for $[Co(cyclam)X_2]Y$ and [Co(trans-14-diene)X_2]Y$ was 1/1, while it was 1/2 for $[M(cyclam)Cl_2]Cl(M=Fe(III),\;Mn(III))$. The results suggested that Co(III)-macrocyclic complexes activated molecular oxygen as superoxolike ${O_2}^-$ and $[M(cyclam)Cl_2]Cl(M=Fe(III),\;Mn(III))$ activated that as peroxolike $O_2^{2-}$.

  • PDF