Subject nitrogen-containing

The photoelimination of carbon dioxide from esters and lactones is a process that has been the subject of detailed investigations. Discussion here is limited to nitrogen containing systems. 3,4-Diphenylsydnone (464), on irradiation in benzene, is converted via the nitrile imine 465 into 2,4,5-triphenyl-1,2,3-triazole (466)388 initial bond formation between N-2 and C-4 followed by loss of carbon dioxide to give the diazirine 467 is proposed to account for the formation of the nitrile imine. Nitrile imines generated in this way have been trapped with alkenes and alkynes to give pyrazoles389... 

Two nitrogen-containing polymeric materials with extended aromatic ladder structures have been chosen for direct fluorination studies (Figure 14.9).57 Pyrolyzed polyacrylonitrile (3) and paracyanogen (4) [poly(pyrazinopryazine)] have been subjected to direct fluorination to produce perfluorinated analogues. 

The study of the effect of the adsorptions of various additives on the anodic dissolution has been the subject of several studies. For instance, the influence of the adsorption of N species on the anodic dissolution of Ni was studied in [43]. The dissolution and passivation of Ni in nitrite-containing acid solutions were investigated by Auger spectroscopy, AFM, and conventional electrochemical techniques. It was found that the dis-solution/passivation of the Ni surface is consistent with a competition between adsorbed OH and nitrogen-containing... 

Four chapters in the present volume bring older reviews up to date. Those on the quinoxalines (Cheeseman and Werstiuk) and on hetero-aromatic quaternization (Zoltewicz and Deady) carry forward contributions on the same subjects in Volumes 2 (1963) and 3 (1964), respectively, of this Series, while those on the phenanthrolines (L. A. Summers) and the isatogens and indolones (Hiremath and Hooper) deal with topics previously covered elsewhere. The cyclazines, a relatively new field of chemistry, are reviewed by Flitsch and Kramer, and the azapentalenes— the wide variety of nitrogen-containing heterocycles formed by the fusion of two aromatic five-membered rings—are collected into one chapter by Elguero, Claramunt, and A. J. H. Summers. 

The current volume consists of four chapters. It commences with a comprehensive survey of the conformational rates and equilibria of saturated nitrogen-containing six-membered rings, authored by T. A. Crabb and the series editor. This is a subject wherein many of the past controversies have now been resolved and where it is now possible to provide a rather satisfying account. 

Several recent reviews on catalytic asymmetric hydrogenation are available. The mechanistic studies have been summarized by Halpern.81,259 The synthesis and use of phosphorus(III) ligands have been reviewed by Horner.270 Ferrocene-based and nitrogen-containing phosphorus ligands have also been covered.271 General reviews of the subject have appeared.272"275... 

Which other nitrogen-containing nonamine organonitrogen compound does aniline most resemble in its toxicological characteristics What is its most common manifestation of toxicity How does this affect the subject ... 

Aside from the various classes of nitrogen containing functional groups with which we are familiar, entire fields of study have developed based on nitrogen-containing compounds. These fields include alkaloids, peptides and/or proteins, and nucleic acids. For purposes of study by NMR, the nucleic acids are a favorite subject because not only is nitrogen ubiquitous in these compounds but so is phosphorus (see Section 6.5). 

Fuel nitrogen is converted to N0X through two pathways homogeneous oxidation of nitrogen-containing volatiles and heterogeneous oxidation of the nitrogen contained in the char. It is the latter mechanism of N0X production that is the subject of this paper. 

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