Oxidative <i>ortho</i>-C-N Fusion of Aniline by OsO<sub>4</sub>. Isolation, Characterization of Oxo-Amido Osmium(VI) Complexes, and their Catalytic Activities for Oxidative C−C Bond Cleavage of Unsaturated Hydrocarbons
作者:Subhas Samanta、Laksmikanta Adak、Ranjan Jana、Golam Mostafa、Heikki M. Tuononen、Brindaban C. Ranu、Sreebrata Goswami
DOI:10.1021/ic801352d
日期:2008.12.1
reaction of osmium(VIII) oxide with p-substituted aromatic amines (X-C(6)H(4)-NH(2), where X = Me, H, Cl) in heptane afforded the brown osmium(VI)-oxo complexes [OsO(L)(2)] (1a-c, L = N-aryl-1,2-arylenediamide) in moderate yields. The ligand L is formed in situ via oxidative ortho-C-N fusion of arylamines. The reaction occurs in an inert atmosphere, and a part of Os(VIII) is used up for the oxidation of aromatic
Aerial Oxidation of Protonated Aromatic Amines. Isolation, X-ray Structure, and Redox and Spectral Characteristics of N- Containing Dyes
作者:Suman K Roy、Subhas Samanta、Mominul Sinan、Pradip Ghosh、Sreebrata Goswami
DOI:10.1021/jo3019126
日期:2012.11.16
This work reports the results of our investigation on the aerial oxidation of aromatic amines that are promoted by protic acid. While primary aromatic amines produce substituted phenazines as major products, N-phenyl-o-phenylenediamine produces polycyclic aromatic heterocycles like azaacene and secondary and tertiary amines give exclusively the dyes containing a triphenylmethane moiety. Isolation of the compounds and the effects of substitutions on the aromatic rings have been investigated. In this context, plausible reaction steps that are involved have been discussed. Single-crystal X-ray structure analyses of the representative compounds are solved to authenticate their formation. In almost every case, a high degree of delocalization of electron was noted. The compounds have been characterized thoroughly and show rich spectral properties. For example, the phenazine molecules exhibited absorption peaks between 475 and 605 nm because of the charge-transfer transition from the amine and tricyclopyrazine moiety. Their acidochromic and solvatochromic behaviors, which are supported by theoretical calculations, are investigated. The polycyclic azacene molecule exhibits strong absorption in the visible region and fluoresces with high quantum yield. The phenazine dyes undergo a quasi-reversible reduction at a low cathodic potential that varies linearly as a function of Hammett's constant.
Barry et al., Journal of the Chemical Society, 1956, p. 893
作者:Barry et al.
DOI:——
日期:——
Barry; Belton, Proceedings of the Royal Irish Academy. Section B: Biological, geological, and chemical science, 1953, vol. 55B, p. 149,153,155
作者:Barry、Belton
DOI:——
日期:——
Balogh-Hergovich, E.; Bodnar, G.; Speier, G, Acta Chimica Academiae Scientiarum Hungaricae, 1981, vol. 108, # 1, p. 37 - 42