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Paperback or Softback. Condizione: New. Dipole Moments in Organic Chemistry. Book.

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Taschenbuch. Condizione: Neu. Neuware -Until the early seventies, tautomeric i. e. fast and reversible rearrangement reactions accompanied by migrations of carbon-centered groups - were practi cally unknown. For a long time it was assumed that the family of tautomeric reactions was confined to proto tropic transformations only. However, the discovery in the fifties of the reversible metallotropic rearrangements showed the domain of migratory tautomerism to be substantially broader. The synthesis of the metallotropic compounds was based on the substitution of a proton in prototropic compounds by an organometallic group. This approach rarely proved fruitful when attempting to effect tautomeric rearrangements of organic and organometallic groups formed by the elements to the right of carbon in the Periodic Table. By contrast, a novel approach involving an analysis of the steric requirements inherent in the structure of the transition state of a reactive center and an examination of the stereodynamic possibilities has given rise to a target-oriented molecular design of compounds capable of rapid and reversible intramolecular migration of the type indicated. The implementation of this ap proach, which is the subject of the present book, has already led to the preparation of new tautomeric compounds in which such heavy organic migrants as acyl, aryl, sulfinyl, phosphoryl, arsinyl, and other groups migrate in molecules at a frequency 6 9 of 10 -10 S-I at ambient temperature, i. e. , at the rates comparable with protonic migrations.…

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hardcover. Condizione: Good. Most items will be dispatched the same or the next working day. A copy that has been read but remains in clean condition. All of the pages are intact and the cover is intact and the spine may show signs of wear. The book may have minor markings which are not specifically mentioned. Ex library copy with usual stamps & stickers.…

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Condizione: New. 1. The Problem of Tautomerism.- 1. Tautomerism as Dynamic Isomerism.- 1.1. Molecular Structure and Isomerism.- 1.2. Bond Rupture Formation Criterion.- 1.3. Tautomerism and Rearrangements.- 1.4. Thermodynamic and Activational Scale of Tautomeric Processes.- .

Taschenbuch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - In accordance with the aims of the series 'Physical Methods in Organic Chemistry,' of which this book forms part, the authors r main aim was a systematic account of the most important methods of using the method of dipole moments in organic chemistry and interpreting its results in practice. Since 1955, when two monographs devoted to the fundamentals and applications of the dipole moment method appeared simultaneously (C. P. Smyth, Dielectric Behavior and Structure, McGraw-Hill, New York; and J. W. Smith, Electric Dipole Moments, Butterworths, London), no generalizing studies of this type have appeared in the Russian and foreign literature. Nevertheless, it is just in this per iod that almost half of all publications on the structure and proper ties of organic compounds by means of the dipole moment method have appeared. During this time, the principles of the method of measure mentand the physical theory of the method have not undergone fundamental changes. Consequently, in giving an account of these matters we considered it sufficient to give a very short introduction to the theory of the method that is not burdened with details of the mathematical derivations and the strict formalism of the theory of dielectrics which are hardly used in the applications of the method that are of interest to the organiC chemist (Chapter I).…

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Taschenbuch. Condizione: Neu. Molecular Design of Tautomeric Compounds | V. I. Minkin (u. a.) | Taschenbuch | Understanding Chemical Reactivity | 312 S. | Englisch | 2011 | Springer | EAN 9789401071406 | Verantwortliche Person für die EU: Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg, juergen[dot]hartmann[at]springer[dot]com | Anbieter: preigu. …

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Condizione: New. Designed to assist chemists in integrating the results of calculations on molecules and ions into their general body of chemical knowledge.&Uumlber den AutorVladimir I. Minkin and Mikhail N. Glukhovtsev are the authors of Aromati.