[PDF] Nuclear Magnetic Resonance Spectroscopy Of Boron Compounds eBook

Author : Heinrich Nöth
Publisher : Springer Science & Business Media
Page : 474 pages
File Size : 27,68 MB
Release : 2012-12-06
Category : Science
ISBN : 3642667570

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The revolutionary impetus of the NMR methods in organic chemistry has parallels in the field of boron chemistry. lIB NMR spectroscopy provided a basis for the elucida tion of structures and reactions of the boron hydrides. However, although many studies have been carried out with the higher boranes, carboranes, metalloboranes, etc. , and although certain patterns have emerged, the correlation between the observed chemical shift and the assigned structural unit is still not fully understood. Therefore, predictions in this area are still rather limited, and semiquantitative interpretations are not yet pos sible. Several years ago Eaton and Lipscomb sUpImarized the status in this field in their book "NMR Studies of Boron Hydrides and Related Compounds" and a plethora of new data has accumulated since then. The book also contained material on simple bo rane derivatives, but they were not discussed in any detail. On the other hand many systematic studies, both synthetic and spectroscopic, have been conducted on these simple boron materials in the last decade. Thus a large amount of NMR information is available, not only on lIB but also on 1 H, 1 3 C, and 14 N. However, this information is widely scattered in the literature, and often the data are not discussed at all. It see med appropriate, therefore, to collect these data and to present them in one volume.

Author : H. Steinberg
Publisher : Elsevier
Page : 499 pages
File Size : 12,53 MB
Release : 2013-09-03
Category : Science
ISBN : 1483224899

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Progress in Boron Chemistry, Volume I is a 10-chapter text that covers the advances in the chemistry of various boron compounds and their applications. The opening chapter deals with the chemistry of compounds containing boron-boron bonds, followed by a brief overview of some aspects of the coordination chemistry of boron. The subsequent chapters discuss the molecular structures of boron hydrides and the chemotherapeutic potential of boron compounds. Other chapters explore the chemistry of other boron compounds, including heteroaromatic boron compounds, organoperoxyboranes, organoboron heterocycles, and boronic acids. The concluding chapter describes the NMR studies of boron compounds. This book is of value to organic, inorganic, and analytical chemists.

Author :
Publisher : Academic Press
Page : 389 pages
File Size : 21,93 MB
Release : 1988-05-01
Category : Science
ISBN : 0080584039

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Annual Reports on NMR Spectroscopy

Author : J. W. Emsley
Publisher : Elsevier
Page : 543 pages
File Size : 46,3 MB
Release : 2013-10-22
Category : Science
ISBN : 1483184080

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High Resolution Nuclear Magnetic Resonance Spectroscopy, Volume 2 provides a comprehensive coverage of the theories and methods for analysis of high resolution spectra. The title also presents a discourse on other variables that affect the spectra. The text first details the correlations of 1H resonance spectral parameters with molecular structure, and then proceeds to tackling the 19F nuclear magnetic resonance studies. Next, the selection deals with the NMR spectra of nuclei other than hydrogen fluoride. The text also provides data sets, such as nuclear properties, T-values, and chemical shifts. The book will be of great use to scientists who utilize nuclear magnetic resonance in their work.

Author : Dennis Marynick
Publisher :
Page : 22 pages
File Size : 23,71 MB
Release : 1968
Category :
ISBN :

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By adopting a classical free electron model for the pentagonal pyramidal systems CnB(6-n)H(10-n) (n = 0,1,2,3,4) and for the tetragonal pyramidal pentaborane and pentagonal bipyramidal 2,4-C2B5H7 it is possible to account for the relative chemical shifts of boron and terminal hydrogen atoms. Also a good correlation is obtained for alkyl protons in those methyl and ethyl derivatives for which spectra are available. In this approach the pyramidal framework is treated as a cone and one or more ring current loops are placed about the conical curved surface parallel to the base. The six 'delocalized' electrons bonding the apex to the base are treated in a manner similar to the ring current approach used for benzene. From the obtained correlations it is clear that this approach has considerable predictive value. (Author).

Author : Kurt Niedenzu
Publisher : Springer Science & Business Media
Page : 184 pages
File Size : 39,39 MB
Release : 2012-12-06
Category : Science
ISBN : 3642858260

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Although the chemistry of boron is still relatively young, it is developing at a pace where even specific areas of research are difficult to compile into a monograph. Besides the boron hydrides, boron-nitrogen compounds are among the most fascinating derivatives of boron. Nitrogen compounds exist in a wide variety of molecular structures and display many interesting properties. The combination of nitrogen and boron, however, has some unusual features that are hard to match in any other combination of elements. This situation was first recognized by ALFRED STOCK and it seems proper to pay tribute to his outstanding work in the area of boron chemistry. One should realize that about forty years ago, STOCK and his coworkers had to develop completely new experimental techniq'\les and that no guidance for the interpreta tion of their rather unusual data had been advanced by theoretical chemists. In this monograph an attempt has been made to explore the general characteristics of structure and the principles involved in the preparation and reactions of boron-nitroge~ compounds. It was a somewhat difficult task to select that information which appears to be of the most interest to "inorganic and general chemistry" since the electronic relationship between a boron-nitrogen and a carbon-carbon grouping is reflected in the "organic" character of many of the reactions and compounds.