Aromaticity in Heterocyclic Compounds (Hardcover, 2009 ed.)

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].

General

Imprint:	Springer-Verlag
Country of origin:	Germany
Series:	Topics in Heterocyclic Chemistry, 19
Release date:	2009
First published:	2009
Editors:	Tadeusz Marek Krygowski • Michal Ksawery Cyranski
Dimensions:	235 x 155 x 25mm (L x W x T)
Format:	Hardcover
Pages:	344
Edition:	2009 ed.
ISBN-13:	978-3-540-68329-2
Categories:	Books > Science & Mathematics > Chemistry > Organic chemistry > General
LSN:	3-540-68329-1
Barcode:	9783540683292

Is the information for this product incomplete, wrong or inappropriate? Let us know about it.

Does this product have an incorrect or missing image? Send us a new image.

Is this product missing categories? Add more categories.

Review This Product

No reviews yet - be the first to create one!