NMR Investigations of Phosphorus-nitrogen and Carbon-nitrogen Compounds PDF Download
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Author: Harold George Parkes
Publisher:
ISBN:
Category :
Languages : en
Pages : 626
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Author: Harold George Parkes
Publisher:
ISBN:
Category :
Languages : en
Pages : 626
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Author: L. H. Merwin
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: H Allcock
Publisher: Elsevier
ISBN: 0323147518
Category : Science
Languages : en
Pages : 513
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Book Description
Phosphorus-Nitrogen Compounds: Cyclic, Linear, and High Polymeric Systems concerns itself with the chemistry of compounds containing alternating phosphorus - nitrogen atoms in the skeleton. The monograph aims to be an introduction to phosphorus-nitrogen chemistry, a review of advances in the field, and reference work. The text is divided into three parts. Part I covers the introduction, historical background, and nomenclature of phosphorus-nitrogen compounds and the theories in bonding and structure of phosphazenes and phosphazanes. Part II deals with reactions such as the synthesis of the phosphorus-nitrogen skeleton, hydrolysis of phosphazenes and phosphazanes, and the aminolysis of halophosphazenes. Part III discusses polymer chemistry and includes topics such as polymerization, depolymerization, and phosphazene polymers. The book is recommended for students and practitioners in the field of chemistry, especially those concerned with phosphorus nitrogen compounds and polymeric systems.
Author: Peter Hanisch
Publisher:
ISBN:
Category : Nitrogen compounds
Languages : en
Pages : 0
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This treatise describes a study of the conformation of nitrogen and phosphorus heterocyclic compounds using carbon-13 nuclear magnetic resonance methods. Isolation and assignment of the configuration of the three diasteroisomers of 1,3,5-trimethyl-4-phenylpiperidin-4- ol and the conformational effects in 2,2,6,6-tetramethyl substituted piperidine rings are described. In addition, the possibility of detecting boat (non-chair) conformations in 4-phenylpiperidin-4-ol derivatives is discussed. A carbon-13 nmr solvent study of the model system, 3-pi peridinol,was carried out to detect conformations where intramolecular hydrogen bonding interactions of the type -N--H-0- are possible. Several 3-tropinone derivatives were studied and evidence is presented for boat (non-chair) conformations where similar -N-C=0 and -N-H-0- interactions are implicated. Several representative six-membered ring phosphorus heterocycles were also studied in both the Pill and PIV oxidation states. Evidence is presented for the predominance of axial phenyl groups in several 1-phenylphosphorinanes. Additivity effects were derived for the phosphorus systems and comparisons made with analogous nitrogen heterocyclic parameters. The effect of the PIV oxidation state upon the chemical shifts in the aromatic ring of various phenyl phosphine oxides and the consequent valence bond structure of these oxides is reported. As a corollary, the chemical shifts of several dienones used as synthetic precursors in the above studies are reported and the effect of introducing a cross-conjugated double bond to the enone in acyclic and alicyclic systems is discussed.
Author: Richard Mokome Mampa
Publisher:
ISBN:
Category : Chemistry, Analytic
Languages : en
Pages : 122
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Author: Olaf Kühl
Publisher: Springer Science & Business Media
ISBN: 3540791183
Category : Science
Languages : en
Pages : 138
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Book Description
Nuclear Magnetic Resonance is a powerful tool, especially for the identification of 1 13 hitherto unknown organic compounds. H- and C-NMR spectroscopy is known and applied by virtually every synthetically working Organic Chemist. Con- quently, the factors governing the differences in chemical shift values, based on chemical environment, bonding, temperature, solvent, pH, etc. , are well understood, and specialty methods developed for almost every conceivable structural challenge. Proton and carbon NMR spectroscopy is part of most bachelors degree courses, with advanced methods integrated into masters degree and other graduate courses. In view of this universal knowledge about proton and carbon NMR spectr- copy within the chemical community, it is remarkable that heteronuclear NMR is still looked upon as something of a curiosity. Admittedly, most organic compounds contain only nitrogen, oxygen, and sulfur atoms, as well as the obligatory hydrogen and carbon atoms, elements that have an unfavourable isotope distribution when it comes to NMR spectroscopy. Each of these three elements has a dominant isotope: 14 16 32 16 32 N (99. 63% natural abundance), O (99. 76%), and S (95. 02%), with O, S, and 34 14 S (4. 21%) NMR silent. N has a nuclear moment I = 1 and a sizeable quadrupolar moment that makes the NMR signals usually very broad and dif cult to analyse.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Peter Khek Keong Lim
Publisher:
ISBN:
Category : Heterocyclic compounds
Languages : en
Pages : 0
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Author: Louis D. Quin
Publisher: VCH Publishers
ISBN:
Category : Science
Languages : en
Pages : 484
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Book Description
Presents advances in 31P NMR and coupling effects of the past six years (since VCH published its first jointly edited monograph on the subject). A wide cross-section of experts contribute a concise account of their use of 31P NMR in their own area of expertise, giving major emphasis to the research results they have obtained since the earlier monograph appeared. The volume is divided into nine sections: chemical shift theory; conformational analysis of phosphorus-containing ring systems; compounds with three-, four-, and five-coordinate phosphorus; low-coordinate phosphorus compounds; metal complexes of phosphorus ligands; biological phosphorus systems; mechanism elucidation in phosphorus chemistry; analytical and interpretive aspects; and NMR with solid phosphorus-containing systems. Annotation copyright by Book News, Inc., Portland, OR
Author: Peter Khek Keong Lim
Publisher:
ISBN:
Category : Heterocyclic compounds
Languages : en
Pages :
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