The Nuclear Magnetic Resonance Analyses of Some Geometric Isomers PDF Download
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Author: Thomas H. Crawford
Publisher:
ISBN:
Category : Nuclear magnetic resonance
Languages : en
Pages : 238
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Book Description
The research problem presented herein involved the structural determination of several a,~-unsaturated acids and esters. The solution to this problem was sought in the nuclear magnetic resonance (n.m.r.) spectra of these compounds. The n.m.r. approach to structural problems in organic chemistry has been investigated extensively in the past ten years and it has proven to be an extremely powerful tool for this type of analysis. The data used in the structural determinations are presented in tabulated fo~, and in. the appendix tracings of the original spectra may be found. Each compound is discussed separately with respect to its probable structure and its recorded spectrum. Two brief sections follow the discussion of the spectra. One of these concerns a stereospecific solvent effect and the other relates to the effect of an anisotropic neighboring double bond on proton r -values. The configurational aSSignments for the various compounds were made possible by observing the changes in chemical shift for particular protons in different isomers and by comparison of the observed spin coupling constants with those reported in the literature. Allmost all of the compounds discussed in this thesis were of such a nature that their spectra could be interpreted on a simple first order basis. In the limited number of cases which involved more complex spectra, some approximations were attempted which made possible the assignment of configuration at several bonds. In some cases the assignments were not conclusive, but they found strong support in the approximate treatments given the complex splitting patterns.
Author: Thomas H. Crawford
Publisher:
ISBN:
Category : Nuclear magnetic resonance
Languages : en
Pages : 238
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Book Description
The research problem presented herein involved the structural determination of several a,~-unsaturated acids and esters. The solution to this problem was sought in the nuclear magnetic resonance (n.m.r.) spectra of these compounds. The n.m.r. approach to structural problems in organic chemistry has been investigated extensively in the past ten years and it has proven to be an extremely powerful tool for this type of analysis. The data used in the structural determinations are presented in tabulated fo~, and in. the appendix tracings of the original spectra may be found. Each compound is discussed separately with respect to its probable structure and its recorded spectrum. Two brief sections follow the discussion of the spectra. One of these concerns a stereospecific solvent effect and the other relates to the effect of an anisotropic neighboring double bond on proton r -values. The configurational aSSignments for the various compounds were made possible by observing the changes in chemical shift for particular protons in different isomers and by comparison of the observed spin coupling constants with those reported in the literature. Allmost all of the compounds discussed in this thesis were of such a nature that their spectra could be interpreted on a simple first order basis. In the limited number of cases which involved more complex spectra, some approximations were attempted which made possible the assignment of configuration at several bonds. In some cases the assignments were not conclusive, but they found strong support in the approximate treatments given the complex splitting patterns.
Author: Satinder Ahuja
Publisher: Elsevier
ISBN: 0080455182
Category : Medical
Languages : en
Pages : 679
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Book Description
High pressure liquid chromatography–frequently called high performance liquid chromatography (HPLC or, LC) is the premier analytical technique in pharmaceutical analysis and is predominantly used in the pharmaceutical industry. Written by selected experts in their respective fields, the Handbook of Pharmaceutical Analysis by HPLC Volume 6, provides a complete yet concise reference guide for utilizing the versatility of HPLC in drug development and quality control. Highlighting novel approaches in HPLC and the latest developments in hyphenated techniques, the book captures the essence of major pharmaceutical applications (assays, stability testing, impurity testing, dissolution testing, cleaning validation, high-throughput screening). A complete reference guide to HPLC Describes best practices in HPLC and offers 'tricks of the trade' in HPLC operation and method development Reviews key HPLC pharmaceutical applications and highlights currents trends in HPLC ancillary techniques, sample preparations, and data handling
Author: William Robert Devereaux
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
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Book Description
Author: David Stuart Stephenson
Publisher:
ISBN:
Category :
Languages : en
Pages : 284
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Book Description
Author: Chemical Society (Great Britain)
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 742
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Book Description
A classified world list of new papers in pure chemistry.
Author: H.N. Cheng
Publisher: iSmithers Rapra Publishing
ISBN: 9781859572481
Category : Science
Languages : en
Pages : 168
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Book Description
Solution-state NMR spectroscopy is generally regarded as the premier technique to characterise polymer structure. This report provides a timely review of the developments in the NMR of polymers in solution in the past few years. An additional indexed section containing several hundred abstracts from the Polymer Library gives useful references for further reading.
Author: Paul Hodgkinson
Publisher: Royal Society of Chemistry
ISBN: 1839167068
Category : Science
Languages : en
Pages : 331
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Book Description
Applications of nuclear magnetic resonance span a wide range of scientific disciplines, from chemistry and physics to medicine. For those wanting to become acquainted with NMR or seasoned practitioners, this is a valuable source of current methods and applications.
Author: Paul Hodgkinson
Publisher: Royal Society of Chemistry
ISBN: 1839167696
Category : Science
Languages : en
Pages : 330
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Book Description
With applications across chemistry, physics and medicine, nuclear magnetic resonance is a proven, uniquely versatile and powerful spectroscopic technique. The success of NMR and its constant redevelopment means that the literature is vast and wide-ranging. Each chapter in this volume is a distillation of the key recent literature in different areas, covering the spectrum of NMR theory and practice, and including solid-state NMR, solution NMR of small molecules and NMR of living systems. These reports are invaluable both for new researchers wishing to engage with literature for the first time, and for seasoned practitioners, particularly service managers, needing to keep in touch with the ever-expanding ways in which NMR is used.
Author: Richard E. McDonald
Publisher: The American Oil Chemists Society
ISBN: 9780935315806
Category : Science
Languages : en
Pages : 424
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Book Description
New Techniques and Applications in Lipid Analysis provides an informative and comprehensive reference book covering the latest and most important analytical topics in lipid chemistry. Researchers in biomedicine, food industry, food processing, product development, nutrition and dietetics, oil processing, fat substitutes, and lipid technology, as well as students in the fields of food science and nutrition, will greatly benefit from this book.
Author: Eugenio Aulisa
Publisher: CRC Press
ISBN: 1420061356
Category : Mathematics
Languages : en
Pages : 1266
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Book Description
A Practical Guide to Geometric Regulation for Distributed Parameter Systems provides an introduction to geometric control design methodologies for asymptotic tracking and disturbance rejection of infinite-dimensional systems. The book also introduces several new control algorithms inspired by geometric invariance and asymptotic attraction for a wide range of dynamical control systems. The first part of the book is devoted to regulation of linear systems, beginning with the mathematical setup, general theory, and solution strategy for regulation problems with bounded input and output operators. The book then considers the more interesting case of unbounded control and sensing. Mathematically, this case is more complicated and general theorems in this area have become available only recently. The authors also provide a collection of interesting linear regulation examples from physics and engineering. The second part focuses on regulation for nonlinear systems. It begins with a discussion of theoretical results, characterizing solvability of nonlinear regulator problems with bounded input and output operators. The book progresses to problems for which the geometric theory based on center manifolds does not directly apply. The authors show how the idea of attractive invariance can be used to solve a series of increasingly complex regulation problems. The book concludes with the solutions of challenging nonlinear regulation examples from physics and engineering.
