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Boron Hydride Chemistry Of N Substituted Iminotriphenylphosphoranes
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Book Synopsis Boron Hydride Chemistry of N-substituted-iminotriphenylphosphoranes by : William Keith Holley
Download or read book Boron Hydride Chemistry of N-substituted-iminotriphenylphosphoranes written by William Keith Holley and published by . This book was released on 1986 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Borane adducts of N-substituted-iminotriphenylphos- phoranes were prepared by two different general synthetic methods. The first method involved displacement of tetra- hydrofuran from borane tetrahydrofuran complex. The second method employed in situ generation of diborane by reaction of lithium borohydride with N-substituted-aminotriphenyl- phosphonium bromides in diethyl ether. The two methods are represented by the following equations: D + C4H8OBH ----> DBH3 + C4H80 C4H80 DH + BH ------> DBH + H 4 (3 2 (C2H5)20 where D = a N-substituted-iminotriphenylphosphorane. A number of symmetrical cations were prepared which contain a BH2 group coordinated with N-alkyliminotri- phenylphosphoranes. They were synthesized by iodination of the corresponding borane adduct followed by bimolecular nucleophilic substitution. The reaction steps are repre- sented by the following equations: 2DBH3 + 12 ---> 2DBH2I + H2 DBH2I + D ---> D2BH2 + I where D = a N-alkyliminotriphenylphosphorane. Physical, chemical and spectral properties of the borane adducts and boron cations, namely thermal and hydro- lytic stability, infrared and nmr spectra were discussed in detail. In addition, the stability of the cations towards Ag(I) and borohydride ions was studied. Discussion on the synthetic methods includes steric and electronic factors of the nucleophiles and substrates, reaction mechanisms and comparison of reactivities of boranes and boron cations, containing phosphoranes as ligands, with the corresponding amine substituted entities. Phosphoranes appear to be better nucleophiles than amines, and phosphorane iodoboranes react faster than trimethylamine iodoborane. Steric and electronic factors appear to play an important role in defining the reactivity of the iodoborane adducts. Comparison of the two methods to prepare borane adducts showed that the second method was preferred. Relative basicities of N-alkyliminotriphenylphos- phoranes were determined by measuring equilibrium constants for exchange of BH3 between phosphoranes and borane adducts of trimethylamine and 4-methylpyridine. It was found that the phosphoranes are less basic than trimethylamine. The amount of pi-bonding between phosphorus and nitro- gen was determined by crystallographic and P nmr data. Reduction of iminotriphenylphosphorane and N, N- dimethylaminotriphenylphosphonium ion by different reducing agents was studied in detail. A new product was isolated and characterized from the reaction of tetra-n-butyl- ammonium borohydride with iminotriphenylphosphorane. The compound was identified as (C6H5)3PN2BH.
Book Synopsis Boron Hydride Chemistry by : Earl Muetterties
Download or read book Boron Hydride Chemistry written by Earl Muetterties and published by Elsevier. This book was released on 2012-12-02 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boron Hydride Chemistry covers the significant contributions of boron hydride research in the subjects of bonding, structure, and stereochemistry. This book contains 12 chapters that illustrate the merging of certain areas of boron hydride chemistry with other disciplines, such as organic, organometallic, and transition metal chemistry. After providing an overview of the general geometric, stereochemical, and dynamic stereochemical features of boron hydrides, this book goes on exploring the bonding theory and theoretical research on boron hydrides, with an emphasis on boron hydrides that have open polyhedral structures. These topics are followed by discussions on gas phase and solution reactions of borane and substituted boranes. A chapter focuses on the chemistry of cations containing boron atoms bonded to hydrogen. The remaining chapters examine the syntheses, structures, bonding, spectral properties, and chemistry of specific boron hydrides, including borazines, closo-boron hydrides, carboranes, icosahedral carboranes, and close- and nido-heteroboranes. Inorganic chemists and researchers, teachers, and undergraduate inorganic chemistry students will find this book invaluable.
Book Synopsis Boron Hydrides by : William N. Lipscomb
Download or read book Boron Hydrides written by William N. Lipscomb and published by Courier Corporation. This book was released on 2013-05-13 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this classic monograph, Nobel Prize–winning chemist William N. Lipscomb elucidates his area of expertise: the general structural principles and reactions of boron hydrides and related compounds. Lipscomb's work appeared only a decade after the structures of boron hydrides were first elucidated and their chemistry formulated into a widely applicable framework. His observations led to a major reconsideration of how atoms bond to form stable molecules. A concise treatment of the many separate parts of the structural theory and its relation to chemistry, this volume begins with an overview of boron hydrides and related structures, progressing to three-center bonds and their applications, molecular orbitals, nuclear magnetic resonance studies of boron hydrides and related compounds, and reactions of the boron hydrides. More than 120 diagrams and figures illustrate a variety of structures.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1987 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Diversity Oriented Synthesis by : Andrea Basso
Download or read book Diversity Oriented Synthesis written by Andrea Basso and published by Frontiers Media SA. This book was released on 2019-03-22 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Has the concept of Diversity Oriented Synthesis remained unchanged over these two decades, or do we observe improvements or deviations from the original guidelines drawn by the pioneers? The aim of this Research Topic is to collect contributions on the state-of-the-art and progress of Diversity Oriented Synthesis, and to foresee its shape in the next decade.
Book Synopsis Targets in Heterocyclic Systems by :
Download or read book Targets in Heterocyclic Systems written by and published by . This book was released on 1997 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Organophosphorus Chemistry by : D W Allen
Download or read book Organophosphorus Chemistry written by D W Allen and published by Royal Society of Chemistry. This book was released on 2014-03-19 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organophosphorus Chemistry provides a comprehensive and critical review of the recent literature. Coverage includes phosphines and their chalcogenides, phosphonium salts, low coordination number phosphorus compounds, penta- and hexa- coordinated compounds, quinquevalent phosphorus acids, nucleotides and nucleic acids, ylides and related compounds, phosphazenes and the application of physical methods in the study of organophosphorus compounds. This is the 40th in a series of volumes which first appeared in 1970 under the editorship of Stuart Trippett and which covered the literature of organophosphorus chemistry published in the period from January 1968 to June 1969, citing some 1370 publications. The present volume covers the literature from January 2009 to January 2010, citing more than 2200 publications, continuing our efforts to provide an up to date survey of progress in an area of chemistry that has expanded significantly over the past 40 years.
Book Synopsis Journal of the American Chemical Society by : American Chemical Society
Download or read book Journal of the American Chemical Society written by American Chemical Society and published by . This book was released on 1961 with total page 1580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the Society are included in v. 1-59, 1879-1937.
Book Synopsis Targets in Heterocyclic Systems by : Orazio A. Attanasi
Download or read book Targets in Heterocyclic Systems written by Orazio A. Attanasi and published by . This book was released on 2009-07-20 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 11 keeps the international standard of the THS series, covering the synthesis, reactivity, activity (including medicinal) and mass spectrometry of different systems.
Book Synopsis Isocyanide Chemistry by : V. Nenajdenko
Download or read book Isocyanide Chemistry written by V. Nenajdenko and published by John Wiley & Sons. This book was released on 2012-06-04 with total page 615 pages. Available in PDF, EPUB and Kindle. Book excerpt: The efficacy of isocyanide reactions in the synthesis of natural or naturallike products has resulted in a renaissance of isocyanide chemistry. Now isocyanides are widely used in different branches of organic, inorganic, coordination, combinatorial and medicinal chemistry. This invaluable reference is the only book to cover the topic in such depth, presenting all aspects of synthetic isonitrile chemistry. The highly experienced and internationally renowned editor has brought together an equally distinguished team of authors who cover multicomponent reactions, isonitriles in total synthesis, isonitriles in polymer chemistry and much more.
Book Synopsis Multicomponent Reactions in Organic Synthesis by : Jieping Zhu
Download or read book Multicomponent Reactions in Organic Synthesis written by Jieping Zhu and published by John Wiley & Sons. This book was released on 2015-02-09 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive and up-to-date, this book focuses on the latest advances in the field, such as newly developed techniques, more environmentally benign processes, broadened scopes, and completely novel MCRs. In addition to carbene-promoted MCRs and frequently applied metal-catalyzed MCRs, it also covers recently developed catalytic enantioselective variants as well as MCR in drug discovery and for the synthesis of heterocyclic molecules and macrocycles. Edited by the leading experts and with a list of authors reading like a "who's who" in multicomponent reaction chemistry, this is definitely a must-have for every synthetic organic chemist as well as medicinal chemists working in academia and pharmaceutical companies.
Download or read book Isonitrile Chemistry written by Ivar Ugi and published by Elsevier. This book was released on 2012-12-02 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic Chemistry, Volume 20: Isonitrile Chemistry discusses the fundamental aspects of the chemistry of isonitriles. This book provides an introduction to as well as a thorough coverage of isonitrile chemistry. Organized into 10 chapters, this volume begins with an overview of the general properties and structure of isonitriles. This text then examines the quantitative study of the kinetics of isonitrile rearrangement as well as the principal resonance structure of the isonitrile molecule. Other chapters consider the experimental and theoretical findings on the fall-off behavior of the unimolecular rate constants of different isonitriles with pressure. This book discusses as well the behavior of isonitriles toward a center of low electron density, which is particularly manifested in the reactivity of alkyl and aryl isonitriles toward diborane and alkyl or arylboranes. The final chapter deals with the inorganic coordination chemistry of isonitriles. This book is a valuable resource for organic chemists.
Download or read book Mass Spectrometry Bulletin written by and published by . This book was released on 1992 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Asymmetric Synthesis by :
Download or read book Advances in Asymmetric Synthesis written by and published by Elsevier. This book was released on 1995-03-01 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Asymmetric Synthesis
Book Synopsis Heme, Chlorophyll, and Bilins by : Alison Smith
Download or read book Heme, Chlorophyll, and Bilins written by Alison Smith and published by . This book was released on 2014-09-01 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Porphyrin Handbook by : Karl Kadish
Download or read book The Porphyrin Handbook written by Karl Kadish and published by Elsevier. This book was released on 2012-12-02 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Porphyrin Handbook, Volume 14: Medical Aspects of Porphyrins provides information pertinent to every aspect of the chemistry, synthesis, spectroscopy, and structure of phthalocyanines. This book examines the biology and medical implications of porphyrin systems. Organized into 12 chapters, this volume begins with an overview of the underlying diagnostic features, mechanisms, and available treatments of erythropoietic disorders due to defective heme biosynthesis. This text then examines the physiopathology of acute intermittent porphyria, which is transmitted as autosomal dominant disorders with incomplete penetrance. Other chapters consider the main characteristics of congenital erythropoietic porphyria, which includes an increased synthesis, accumulation, ad excretion of porphyrins. This book discusses as well the biochemistry, pathophysiology, and clinical features of variegate porphyria in the light of several essential advances in the understanding, management, and diagnosis of variegate porphyria. The final chapter deals with the legal use of herbal and complementary medicines. This book is a valuable resource for research scientists, engineers, and clinicians.
Book Synopsis Heterocyclic Chemistry by : H. Suschitzky
Download or read book Heterocyclic Chemistry written by H. Suschitzky and published by Royal Society of Chemistry. This book was released on 1980 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry. For over 80 years the Royal Society of Chemistry and its predecessor, the Chemical Society, have been publishing reports charting developments in chemistry, which originally took the form of Annual Reports. However, by 1967 the whole spectrum of chemistry could no longer be contained within one volume and the series Specialist Periodical Reports was born. The Annual Reports themselves still existed but were divided into two, and subsequently three, volumes covering Inorganic, Organic and Physical Chemistry. For more general coverage of the highlights in chemistry they remain a 'must'. Since that time the SPR series has altered according to the fluctuating degree of activity in various fields of chemistry. Some titles have remained unchanged, while others have altered their emphasis along with their titles; some have been combined under a new name whereas others have had to be discontinued. The current list of Specialist Periodical Reports can be seen on the inside flap of this volume.
