Active nitrogen with other atoms

Freeman and Winkler studied the reaction of active nitrogen with ammonia their results indicate that the participation of species other than atomic nitrogen... 

The exclusion of nitrogen-bridged bicyclic azines is purely arbitrary since the work on such azinoazines with a 10 7r-electron system (and the necessarily accompanying quaternary nitrogen-bridgehead atom) shows the activation expected of other aromatic azinium... 

Associated to copper(II) pre-catalysts, bis(oxazolines) also allowed the asymmetric Diels-Alder and hetero Diels-Alder transformations to be achieved in nearly quantitative yield and high diastereo- and enantioselectivities. Optically active sulfoximines, with their nitrogen-coordinating site located at close proximity to the stereogenic sulfur atom, have also proven their efficiency as copper ligands for these asymmetric cycloadditions. Other precursors for this Lewis acid-catalyzed transformation have been described (e.g., zinc salts, ruthenium derivatives, or rare earth complexes) which, when associated to bis(oxazolines), pyridine-oxazolines or pyridine-bis(oxazolines), led to efficient catalysts. 

Active nitrogen has been a favorite subject of investigation by physicists for many years and, more recently, interest has also been aroused in its chemical behavior. However, serious difficulties have been experienced in this connection as a result of the presence of other active species besides nitrogen atoms. These have been difficult to identify with certainty and to separate kinetically. Substantial progress seems now to have been made in this respect and also it appears that complications are reduced when a microwave discharge is used to activate... 

In atomic flames, where one might expect direct excitation of a metal atom as third body, an intermediate is often involved instead. For example, in studies of excitation of iron by nitrogen atoms in CO it has been postulated that Fe is excited by collision with excited N2 or CO produced as third bodies in the atom recombination process178. Brennen and Kistiakowsky55 studied the excitation of nickel, iron and other metals in active nitrogen and concluded that the metal atom is not excited as third body in the recombination process, but by interaction with the metastable N2 (A3XI ). 

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