Aromatic nitrogen-containing

By far the most important fibre-reactive groups which react by nucleophilic substitution contain six-membered aromatic nitrogen-containing heterocyclic rings with halogen substituents. The first group of com-... 

A-Amine oxides can be reduced (deoxygenated) to tertiary amines. Such a reaction is very desirable, especially in aromatic nitrogen-containing heterocycles where conversion to amine oxides makes possible electrophilic substitution of the aromatic rings in different positions than it occurs in the parent heterocyclic compounds. The reduction is very easy and is accomplished by catalytic hydrogenation over palladium [736, 737], by borane [738], by iron in... 

The a-metalation of azoles (aromatic nitrogen-containing five-mem-bered rings) is a much more facile process than that for the analogous saturated systems, and a small number of heterocycles containing free NH groups can undergo some direct lithiation, despite the ionization of the... 

As early as 1964, polycyclic aromatic hydrocarbons (PAHs) known to be carcinogenic, such as benzo[a]pyrcne, were detected in broiled meat (164). A number of papers have been published about PAHs found in smoked and thermally treated foods as a result of pyrolysis or incomplete combustion of organic matter (165 -169). Less information is available on the nitrogen analogs, the basic azaarenes polycyclic aromatic nitrogen-containing hydrocarbons (PANHs), but they have been shown to be present in association with PAHs in various samples that contain nitrogen, such as processed food (170-172). 

Nitrogenous base. An aromatic nitrogen-containing molecule with basic properties. Such bases include purines and pyrimidines. 

Janiak, C., A critical account on 7t-7t stacking in metal complexes with aromatic nitrogen-containing ligands. J. Chem. Soc., Dalton Trans. 2000, 3885-3896. 

J.W. Richter and H.H. Hoehn, Selective Aromatic Nitrogen-containing Polymeric Membranes, US Patent 3,567,632 (March, 1971). 

M-Oxides. The reagent also reacts with aromatic nitrogen-containing heterocydes to give high yields of N-oxides (90-100%). However, 2,2 -bipyridyl and o-phenanthro-line are not oxidized. 

The reduction of aromatic nitrogen-containing heterocycles with NaBH4-NiClj in methanol, which does not perturb aromatic carbon-containing rings (Section 3.3.3) ... 

Case Study III - 2,2 -Bipyridine (2,2 -BI on Au(hld) 2,2 -bipyridine is a bidentate ligand used in coordination chemistry and a typical representative of aromatic, nitrogen-containing heterocycles, which act as basic building blocks in highly specific and functionalized host lattices at defined surfaces [548, 549]. Two planar pyridine rings are connected via a C—C bond with 10% double-bond character [550]. Electrochemical studies revealed that n, n -bipyridine [551-553] and several of its Co " " and Ni " " complexes [554] form 2D condensed films at the atomically smooth mercury-electrolyte interface. The adsorption of 2,2 -bipyridine on solid electrodes, such as Ag(poly), Au(hkl), and Cu(lll) was studied by... 

Metallic palladium, which is formed during the catalytic reactions, can be reactivated by contact with heterocyclic aromatic nitrogen containing ligands, halide derivatives of elements of the III- J groups or Py.HCl and oxidizing agents 042,14. ... 

Several other aromatic nitrogen-containing five-membered ring heterocycles are shown below (Figure 1.40). 

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