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9783642087936: Aromaticity in Heterocyclic Compounds

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ISBN 10 : 3642087930 ISBN 13 : 9783642087936

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Heterocyclic chemistry is the biggest branch of chemistry covering two-thirds of the chemical literature. Aromaticity in Heterocyclic Compounds covers hot topics of frontier research summarized by reputed scientists in the field.

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�diteur: Springer
Date d'�dition: 2010
Langue: anglais
ISBN 10: 3642087930
ISBN 13: 9783642087936
Reliure: Broch�
Nombre de pages: 360
�diteur: Krygowski Tadeusz Marek, Cyranski Michal Ksawery
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Aromaticity in Heterocyclic Compounds (eng)

Krygowski, Tadeusz Marek

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Aromaticity in Heterocyclic Compounds

Krygowski, Tadeusz Marek|Cyranski, Michal Ksawery

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ISBN 10 : 3642087930 ISBN 13 : 9783642087936

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Etat : New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Heterocyclic chemistry is the biggest branch of chemistry covering two-third of the chemical literatureSeries covers hot topics of frontier research summarized by reputed scientists in the field Our review series is topic relatedOnli. N� de r�f. du vendeur 5047822

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Aromaticity in Heterocyclic Compounds

Michal Ksawery Cyranski

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Taschenbuch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Aromaticity is a notion that appeared in the mid-nineteenth century to differentiate between unsaturated hydrocarbons and formally unsaturated benzene [1-3]. At the end of the nineteenth century it seemed that cyclicity was a necessary condition for differentiation between the two, but at the beginning of the twentieth century it turned out that the above assumption was not correct because cyclooctatetraene exhibited typical properties known for polyenes [4]. The essential property of b- zene-like compounds, often identified with aromatic compounds, was low react- ity. Hence thermodynamic stability was defined as resonance energy [5, 6] and was the first quantitative measure of aromaticity. Many theoretical approaches were proposed later to estimate this quantity, and now the criterion is often considered to be the most fundamental [7]. Almost at the same time, magnetic susceptibility was used to describe aromaticity [8, 9]. Consequently, many concepts based on mag- tism were developed, probably the most effective in assessment of aromaticity being nucleus independent chemical shift (NICS) [10] or Fowler's maps of ring currents [11]. The criterion served Schleyer as a basis for a definition of aromat- ity: 'Compounds which exhibit significantly exalted diamagnetic susceptibility are aromatic. Cyclic delocalisation may also result in bond length equalization, abn- mal chemical shifts and magnetic anisotropies, as well as chemical and physical properties which reflect energetic stabilisation'[12]. 360 pp. Englisch. N� de r�f. du vendeur 9783642087936

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Aromaticity in Heterocyclic Compounds

Tadeusz Marek Krygowski (u. a.)

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Aromaticity in Heterocyclic Compounds

Tadeusz Marek Krygowski

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Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware -Aromaticity is a notion that appeared in the mid-nineteenth century to differentiate between unsaturated hydrocarbons and formally unsaturated benzene [1�3]. At the end of the nineteenth century it seemed that cyclicity was a necessary condition for differentiation between the two, but at the beginning of the twentieth century it turned out that the above assumption was not correct because cyclooctatetraene exhibited typical properties known for polyenes [4]. The essential property of b- zene-like compounds, often identified with aromatic compounds, was low react- ity. Hence thermodynamic stability was defined as resonance energy [5, 6] and was the first quantitative measure of aromaticity. Many theoretical approaches were proposed later to estimate this quantity, and now the criterion is often considered to be the most fundamental [7]. Almost at the same time, magnetic susceptibility was used to describe aromaticity [8, 9]. Consequently, many concepts based on mag- tism were developed, probably the most effective in assessment of aromaticity being nucleus independent chemical shift (NICS) [10] or Fowler�s maps of ring currents [11]. The criterion served Schleyer as a basis for a definition of aromat- ity: �Compounds which exhibit significantly exalted diamagnetic susceptibility are aromatic. Cyclic delocalisation may also result in bond length equalization, abn- mal chemical shifts and magnetic anisotropies, as well as chemical and physical properties which reflect energetic stabilisation�[12].Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 360 pp. Englisch. N� de r�f. du vendeur 9783642087936

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Aromaticity in Heterocyclic Compounds

Tadeusz Marek Krygowski

Edit� par Springer, 2010

ISBN 10 : 3642087930 ISBN 13 : 9783642087936

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Taschenbuch. Etat : Neu. Druck auf Anfrage Neuware - Printed after ordering - Aromaticity is a notion that appeared in the mid-nineteenth century to differentiate between unsaturated hydrocarbons and formally unsaturated benzene [1-3]. At the end of the nineteenth century it seemed that cyclicity was a necessary condition for differentiation between the two, but at the beginning of the twentieth century it turned out that the above assumption was not correct because cyclooctatetraene exhibited typical properties known for polyenes [4]. The essential property of b- zene-like compounds, often identified with aromatic compounds, was low react- ity. Hence thermodynamic stability was defined as resonance energy [5, 6] and was the first quantitative measure of aromaticity. Many theoretical approaches were proposed later to estimate this quantity, and now the criterion is often considered to be the most fundamental [7]. Almost at the same time, magnetic susceptibility was used to describe aromaticity [8, 9]. Consequently, many concepts based on mag- tism were developed, probably the most effective in assessment of aromaticity being nucleus independent chemical shift (NICS) [10] or Fowler's maps of ring currents [11]. The criterion served Schleyer as a basis for a definition of aromat- ity: 'Compounds which exhibit significantly exalted diamagnetic susceptibility are aromatic. Cyclic delocalisation may also result in bond length equalization, abn- mal chemical shifts and magnetic anisotropies, as well as chemical and physical properties which reflect energetic stabilisation'[12]. N� de r�f. du vendeur 9783642087936

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