N chemistry

GRASSIE, n., Chemistry of High Polymer Degradation Processes, Butterworths, London (1956)... 

The only sulfur isotope with a nuclear spin is which is quadrupolar (/ = 3/2) and of low natural abundance (0.76%). In view of these inherent difficulties and the low symmetry around the sulfur nuclei in most S-N compounds, S NMR spectroscopy has found very limited application in S-N chemistry. However, it is likely that reasonably narrow resonances could be obtained for sulfur in a tetrahedral environment, e.g. [S(N Bu)4], cf. [S04] . On the other hand both selenium and tellurium have isotopes with I = Vi with significant natural abundances ( Se, 7.6% and Te, 7.0%). Consequently, NMR studies using these nuclei can provide useful information for Se-N and Te-N systems. 

In spite of the hazardous nature of Sc4N4, this binary selenium nitride has been used for the synthesis of other Se-N compounds, all of which have sulfur analogues (Scheme 5.2). " However, safer alternatives to the use of Sc4N4, e.g., selenium-nitrogen halides and silicon-nitrogen-selenium reagents, are available for the development of Se-N chemistry. ... 

A minor success is also seen in complexes of d and d" ions, in which the distorted octahedral geometries observed may be rationalized (and indeed predicted) in terms of the Jahn-Teller effect, and ultimately in terms of the steric activity of the open d shell. This is a common feature in copper(n) chemistry, and you will... 

The finding of preparatively available iminoboranes RB = NR some years ago opened exciting new possibilities not only in B—N chemistry, but also in coordination chemistry. The first examples of iminoborane-transition-metal complexes have now been published. The structurally completely characterized t-BuB = NBu-t adds, like its alkyne analog, to the 03(00)5 fragment as a bridging ligand. When Co2(CO)g and t-BuB = NBu-t are dissolved in pentane at 0°C, warming to RT and evaporation of unreacted iminoborane yields (t-BuBNBu-t)Co2(CO)5 (86%) as a black solid, which can be recrystallized from ether-nitromethane (1 3) ... 

Dev Choudhury, M. N., Chemistry of tea flavor. In Atal, C. K. and Kapur, B. M., Eds., Cultivation and Utilization of Aromatic Plants. Jammu-Tawi Council of Science and Industrial Research (India), 1982, p. 715. 

The discovery in 1973 that polysulfur nitride (SN)X, a polymer comprised only of non-metallic elements, behaves as a superconductor at 0.26 K sparked widespread interest in sulfur-nitrogen (S-N) chemistry. In the past 30 years, the field of inorganic S-N chemistry has reached maturity and interfaces with other areas of chemistry, e.g., theoretical chemistry, materials chemistry, organic synthesis, polymer chemistry and biochemistry, have been established and are under active development. This interest has been extended to Se-N and, to a lesser extent, Te-N systems. 

The [S2N]+ cation is an important reagent in S-N chemistry,63 especially in thermally allowed cycloaddition reactions with organic nitriles and alkynes, which give quantitative yields of heterocyclic cations (Scheme 3). It is conveniently prepared by reaction of S3N2C12 with AsF5 and S8 in liquid S02.63b The [SNS]+ cation is linear with S-N bond distances in the range indicating a bond order of two, i.e., S=N+=S. 

Finlayson-Pitts, B. J. and Pitts, J. N. Chemistry of the upper and lower atmosphere, Academic Press, San Diego, California, USA, 2000. 

Melnikov, N.N. Chemistry of Pesticides (New York Springer-Verlag, 1971), 480 p. 

U.S. Environmental Protection Agency, Pesticide Assessment Guidelines, Subdivision N, Chemistry, Environmental Fate, October 1982. EPA-540/9-82-021,... 

The technique of X-ray crystallography has been, and will remain, indispensable for the determination of the unusual structures of S—N compounds. A more recent development is the application of N NMR spectroscopy in S—N chemistry. Despite the necessity to employ N-enriched materials for these studies, the judicious application of this technique in both structural determinations and in monitoring the progress of reactions will undoubtedly accelerate the progress of the subject. The advent of MCD spectroscopy and the use of the perimeter model have also enhanced our understanding of the electronic structures of cyclic S—N molecules. Rapid advances in this area are to be expected. 

Dhar, D.N., Chemistry of Chalcones and Related Compounds. Wiley, New York, 1981. 

Prescott, C.N., Chemistry A Course for 0 Level. Times Media Private Limited, Singapore 2000. 

Danili, E. and Reid, N. Chemistry Education Research and Practice 2005, 6, 204. 

In contrast to radical ions generated from alkenes or carbonyl compounds, substantially fewer recent reports have appeared which describe the chemistry of radical ions generated from the >C=N— functional group. This situation likely results from the relative obscurity of the >C=N— group (compared to >C=0 and >C=C<), rather than specific problems with the chemistry, per se. Based upon the limited data available, and as might be anticipated, >C=N— + chemistry appears to be analogous to that of >C=C< +, while >C=N— chemistry is reminiscent of >C=0. ... 

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