Download or read book Investigations of Structure and Mechanism in Organic Reactions Using Kinetic Isotope Effects written by Matthew P. Meyer and published by . This book was released on 2001 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Investigation of Organic Reactions and Their Mechanisms written by Howard Maskill and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: A range of alternative mechanisms can usually be postulated for most organic chemical reactions, and identification of the most likely requires detailed investigation. Investigation of Organic Reactions and their Mechanisms will serve as a guide for the trained chemist who needs to characterise an organic chemical reaction and investigate its mechanism, but who is not an expert in physical organic chemistry. Such an investigation will lead to an understanding of which bonds are broken, which are made, and the order in which these processes happen. This information and knowledge of the associated kinetic and thermodynamic parameters are central to the development of safe, efficient, and profitable industrial chemical processes, and to extending the synthetic utility of new chemical reactions in chemical and pharmaceutical manufacturing, and academic environments. Written as a coherent account of the principal methods currently used in mechanistic investigations, at a level accessible to academic researchers and graduate chemists in industry, the book is highly practical in approach. The contributing authors, an international group of expert practitioners of the techniques covered, illustrate their contributions by examples from their own research and from the relevant wider chemical literature. The book covers basic aspects such as product analysis, kinetics, catalysis, and investigation of reactive intermediates. It also includes material on significant recent developments, e.g. computational chemistry, calorimetry, and electrochemistry, in addition to topics of high current industrial relevance, e.g. reactions in multiphase systems, and synthetically useful reactions involving free radicals and catalysis by organometallic compounds.
Download or read book Kinetic Isotope Effects Dynamic Effects and Mechanistic Studies of Organic Reactions written by Zhihong Wang and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Several organic reactions that could potentially involve coarctate transition states were investigated by a combination of experimental and theoretical studies. In the thermal fragmentation of [delta]-1,3,4-oxadiazolines, the mechanism supported by kinetic isotope effects and theoretical calculations is a three-step process that does not demonstrate any special stabilization in coarctate transition states. Rather than undergoing a direct coarctate conversion to product, the mechanism avoids coarctate steps. The last step is a concerted coarctate reaction, but being concerted may be viewed as being enforced by the necessity to avoid high-energy intermediates. In the deoxygenation of epoxides with dichlorocarbene, the stabilization from the transition state aromaticity is not great enough to compete with the preference for asynchronous bonding changes. KIEs and calculations suggested that the reaction occurs in a concerted manner but with a highly asynchronous early transition state with much more C[alpha]-O bond breaking than C[beta]-O bond breaking. In the Shi epoxidation, a large [beta]-olefinic 13C isotope effect and small [alpha-carbon isotope effect indicated an asynchronous transition state with more advanced formation of the C-O bond to the [beta]-olefinic carbon. The calculated lowest-energy transition structures are generally those in which the differential formation of the incipient C-O bonds, the "asynchronicity," resembles that of an unhindered model, and the imposition of greater or less asynchronicity leads to higher barriers. In reactions of cis-disubstituted and terminal alkenes using Shi's oxazolidinone catalyst, the asynchronicity of the epoxidation transition state leads to increased steric interaction with the oxazolidinone when a [pi]-conjugating substituent is distal to the oxazolidinone but decreased steric interaction when the [pi]-conjugating substituent is proximal to the oxazolidinone. Dynamic effects were studied in Diels-Alder reaction between acrolein and methyl vinyl ketone. This reaction yields two products in a ratio of 3.0 " 0.5. Theoretical studies shows that only one transition structure is involved in the formation of both. Quasiclassical trajectory calculations on an MP2 surface give a prediction of a product ratio of 45:14 (3.2:1), which is in good agreement with the experimental observation.
Download or read book Organic Reactions written by Ferenc Ruff and published by Elsevier Publishing Company. This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hardbound. This book begins with a brief survey of non-kinetic methods, and continues with kinetic methods used for the elucidation of reaction mechanisms. It is method oriented and therefore deals with the following topics: basic principles of reaction kinetics; Structure and reactivity relationships; isotope effects; acids, bases, electrophiles and nucleophiles; and concludes with homogeneous catalysis.Rigorous mathematical descriptions of the basic principles are provided in a clear and easily understandable form. The book is more comprehensive than many physical organic texts and it is supported by an extensive list of references. It also contains a valuable collection of problems.
Download or read book Measurement and Analysis of Kinetic Isotope Effects written by and published by Academic Press. This book was released on 2017-09-12 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental Analysis of Enzyme Mechanism Using Isotope Effects, Volume 596, the latest release in the Methods in Enzymology series, continues the legacy of this premier serial with quality chapters authored by leaders in the field. Chapters in this comprehensive update include Measurement of enzyme binding isotope effects, Chemical ligation and isotope labeling to locate dynamic effects, Measurement of heavy enzyme isotope effects, Extracting kinetic isotope effects from a global analysis of reaction progress curves, KIE of metabolic flux and enzymes, Solvent and Primary KIE on Flavin Enzymes, and The Rapid Determination of Primary Deuterium Isotope Effects on Enzyme-Catalyzed Proton Transfer at Carbon in 50/50 HOH/DOD. Readers who are interested in applying or understanding this research will find useful methods currently used for measuring isotope effects on solution and enzyme reactions. Written by pioneers of modern isotope effect research Is the only collection of modern kinetic isotope effect methods currently available
Download or read book Isotope Effects In Chemistry and Biology written by Amnon Kohen and published by CRC Press. This book was released on 2005-11-01 with total page 1092 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of isotope effects has expanded exponentially in the last decade, and researchers are finding isotopes increasingly useful in their studies. Bringing literature on the subject up to date, Isotope Effects in Chemistry and Biology covers current principles, methods, and a broad range of applications of isotope effects in the physical, biolo
Download or read book Heavy atom Kinetic Isotope Effects written by Marvin J. Stern and published by . This book was released on 1972 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Elucidation of Mechanisms of Multicentered Organic Reactions by the Use of Kinetic Isotope Effects written by William Shakespeare Morrison and published by . This book was released on 1973 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Concerted Organic and Bio Organic Mechanisms written by Andrew Williams and published by CRC Press. This book was released on 2020-11-25 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concept of concerted mechanisms was formulated nearly 90 years ago and virtually all general organic chemistry texts mention it. Until now, however, no monograph has addressed the concept explicitly. Over the last two decades, substantial advancements made in the development of precise methods for elucidating concerted mechanisms have heightened the need for a comprehensive text on the subject. Concerted Organic and Bio-organic Mechanisms gathers the salient materials related to this emerging field into a single text. It sets forth the precise definition of concertedness-along with working sub-definitions-and describes rigorous experimental tools chemists can use to diagnose the existence or absence of concerted mechanisms. Advances in our understanding of concerted mechanisms lead to further questions. Concerted Organic and Bio-organic Mechanisms provides the background and the tools researchers need to consider these important questions and further advance the frontiers of reactions, synthesis, and catalysis.
Download or read book Kinetic Isotope Effect Investigation of Enzyme Mechanism in Organic Solvents written by Kenneth A. H. Adams and published by . This book was released on 1990 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Organic Chemistry written by Francis A. Carey and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 829 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this edition, like that of the earlier ones, is to provide the basis for a deeper understanding of the structures of organic compounds and the mechanisms of organic reactions. The level is aimed at advanced undergraduates and beginning graduate students. Our goals are to solidify the student's understanding of basic concepts provided by an introduction to organic chemistry and to present more information and detail, including quantitative information, than can be presented in the first course in organic chemistry. The first three chapters consider the fundamental topi~s of bonding theory, stereochemistry, and conformation. Chapter 4 discusses the techniques that are used to study and characterize reaction mechanisms. Chapter 9 focuses on aromaticity and the structural basis of aromatic stabilization. The remaining chapters consider basic reaction types, including substituent effects and stereochemistry. As compared to the earlier editions, there has been a modest degree of reorganization. The emergence of free-radical reactions in synthesis has led to the inclusion of certain aspects of free-radical chemistry in Part B. The revised chapter, Chapter 12, empha sizes the distinctive mechanistic and kinetic aspects of free-radical reactions. The synthetic applications will be considered in Part B. We have also split the topics of aromaticity and the reactions of aromatic compounds into two separate chapters, Chapters 9 and 10. This may facilitate use of Chapter 9, which deals with the nature of aromaticity, at an earlier stage if an instructor so desires.
Download or read book Enzyme Mechanism from Isotope Effects written by Paul F. Cook and published by CRC Press. This book was released on 1991-09-20 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: Isotope effects have become one of the most powerful tools available to the enzymologist for probing enzymic mechanisms. Enzyme Mechanism from Isotope Effects presents the basic theory underlying isotope effects, including the latest findings on proton tunneling and coupled atomic notions. Specific theoretical applications are emphasized in regard to the types of information that can be obtained using isotope effects. The book also examines recent theoretical treatments of the product dependence of deuterium isotope effects, multiple isotope effects and isotope effects on intermediate partitioning. Other topics include a complete discussion of methods for measuring isotope effects, including a detailed description of the use of the isotope ratio mass spectrometer to obtain isotope effects, and a review of the literature regarding mechanistic information obtained from isotope effects for individual classes of enzyme-catalyzed reactions. Enzyme Mechanism from Isotope Effects is an excellent reference source for investigators using isotope effects in their research. The book is also valuable for reference libraries and instructors teaching courses in enzyme mechanism.
Download or read book Theoretical Principles of Isotope Methods for Investigating Chemical Reactions written by Simon Zalmanovich Roginskiĭ and published by . This book was released on 1956 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Physical Organic Chemistry written by and published by Elsevier. This book was released on 2004-10-06 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Physical Organic Chemistry provides the chemical community with authoritative and critical assessments of the many aspects of physical organic chemistry. The field is a rapidly developing one, with results and methodologies finding application from biology to solid state physics.
Download or read book Heavy Atom Isotope Effects written by E. Buncel and published by . This book was released on 1992 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Kinetics and Inorganic Reaction Mechanisms written by Smiljko Asperger and published by Springer Science & Business Media. This book was released on 2011-06-27 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: The serious study of the reaction mechanisms of transition metal com plexes began some five decades ago. Work was initiated in the United States and Great Britain; the pioneers ofthat era were, inalphabetical order, F. Basolo, R. E. Connick, 1. O. Edwards, C. S. Garner, G. P.Haight, W. C. E. Higgision, E.1. King, R. G. Pearson, H. Taube, M.1. Tobe, and R. G. Wilkins.A larger community of research scientists then entered the field, many of them stu dents ofthose just mentioned. Interest spread elsewhere as well, principally to Asia, Canada, and Europe. Before long, the results ofindividual studies were being consolidated into models, many of which traced their origins to the better-established field of mechanistic organic chemistry. For a time this sufficed, but major revisions and new assignments of mechanism became necessary for both ligand sub stitution and oxidation-reduction reactions. Mechanistic inorganic chemistry thus took on a shape of its own. This process has brought us to the present time. Interests have expanded both to include new and more complex species (e.g., metalloproteins) and a wealth of new experimental techniques that have developed mechanisms in ever-finer detail. This is the story the author tells, and in so doing he weaves in the identities of the investigators with the story he has to tell. This makes an enjoyable as well as informative reading.
Download or read book Kinetic Isotope Effect Studies on the Catalytic Mechanisms of Aspartate Aminotransferase and Chymotrypsin written by Douglas Albert Julin and published by . This book was released on 1984 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
