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Sunday, July 26, 2020 | History

6 edition of Kekulé structures in benzenoid hydrocarbons found in the catalog.

Kekulé structures in benzenoid hydrocarbons

by Sven J. Cyvin

  • 365 Want to read
  • 28 Currently reading

Published by Springer-Verlag in Berlin, New York .
Written in English

    Subjects:
  • Polycyclic aromatic hydrocarbons.

  • Edition Notes

    StatementS.J. Cyvin, I. Gutman.
    SeriesLecture notes in chemistry ;, 46
    ContributionsGutman, Ivan, 1947-
    Classifications
    LC ClassificationsQD341.H9 C96 1988
    The Physical Object
    Paginationxv, 348 p. :
    Number of Pages348
    ID Numbers
    Open LibraryOL2526806M
    ISBN 100387188010
    LC Control Number88002017

    ALTAN-BENZENOID HYDROCARBONS where the pairs ki, ki′; i = 1,2,3 should be compared. Therefore, any altan-ben-zenoid has at least two times as many Kekulé structures as the parent benzenoid hydrocarbon, i.e., KAG KG()2()≥. Now, it will be proven that in all cases, the equality KAG KG()2()= holds. Fig. 4. In this section we are concerned with Kekulèan benzenoid hydrocarbons, that is benzenoid systems possessing Kekulè structures and therefore a non-zero HOMO-LUMO gap. We require that these be polycyclic, that is to possess at least two mutually condensed benzene rings. Consequently, the smallest benzenoid hydrocarbon is naphthalene (n = 10).

    Abstract. This book is a compilation of data on approximat organic compounds, presented in a number of useful formats. Volumes I and II contain an alphabetical listing of compounds, giving the following information, where applicable, for each: common names and synonyms, melting and boiling point, molecular formula and weight, line formula, refractive index, density, color. I. Gutman, S. Radenković, A simple formula for calculating resonance energy of benzenoid hydrocarbons, Bulletin of the Chemists and Technologists of Macedonia 25 () 17± I. Gutman, S. Radenković, Estrada index of benzenoid hydrocarbons, Zeitschrift für Naturforschung 62a () I.

    structure of the benzenoid hydrocarbon considered) by nij. Note that the number of single bonds of type i{j in the same Kekul e structure is then mij nij. In the theory of benzenoid systems it is known [13] that the numbers mij satisfy the following relations: m22 = b+6 (3) m23 = . Structure and Stability of Benzene Formula: C 6H 6, four degrees of unsaturation (section ) three double bonds + one ring The π-bonds of benzene are resistant to the normal reactions of alkenes and alkynes Br Br Cl CHO CHO Br 2 HCl O 3 No Reaction Benzene’s cyclic conjugated structure gives it special stability


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Kekulé structures in benzenoid hydrocarbons by Sven J. Cyvin Download PDF EPUB FB2

This text is an attempt to outline the basic facts concerning Kekul€ structures in benzenoid hydrocarbons: their history, applica­ tions and especially enumeration. We further pOint out the numerous and often quite remarkable connections between this topic and various parts of combinatorics and discrete mathematics.

Our book is primarily Cited by: Get this from a library. Kekulé Structures in Benzenoid Hydrocarbons. [S J Cyvin; I Gutman] -- This text outlines the basic facts concerning Kekulé structures in benzenoid hydrocarbons: their history, applications and especially enumeration.

The book is primarily aimed at organic and. This text is an attempt to outline the basic facts concerning KekulEURO structures in benzenoid hydrocarbons: their history, applica tions and especially enumeration.

We further pOint out the numerous and often quite remarkable connections between this topic and various parts of combinatorics and discrete mathematics.

Our book is primarily aimed toward organic and theoretical chemists. ISBN: OCLC Number: Description: xv, pages: illustrations ; 24 cm. Contents: 1 - Introduction.- Benzenoid Hydrocarbons.- Historical Remarks.- Importance of Kekule Structures in the Theory of Benzenoid Hydrocarbons.- General.- Total?-Electron Energy.- Resonance.

This text is an attempt to outline the basic facts concerning Kekul€ structures in benzenoid hydrocarbons: their history, applica­ tions and especially enumeration. We further pOint out the numerous and often quite remarkable connections between this topic and various parts of combinatorics and discrete mathematics.

An algebraic Kekulé structure of a benzenoid hydrocarbon is obtained from an ordinary Kekulé structure by inscribing into each hexagon the number of π-electrons which (according to this Kekulé structure) belong to this hexagon.

We show that in the case of catafusenes, there is a one-to-one correspondence between ordinary and algebraic Kekulé structures. An algebraic Kekulé structure of a benzenoid hydrocarbon is obtained from an ordinary Kekule structure by inscribing into each hexagon the number of π-electrons which (according to this Kekulé.

This reference book provides an overview of the field of polycyclic aromatic (benzenoid) hydrocarbons, grouped into a systematic framework for the first time. whole book by Cyvin and Gutman [14] is devoted to that topic.

It is also discussed at length in several surveys of two recent volumes on Advances in the theory of benzenoid hydrocarbons [16, 17] and in numerous papers cited there. In this work, we are interested in determining the number of Kekule structures of any polybenzenoïd monoradical having. A kinetically blocked 1,dibenzopentacene: a persistent triplet diradical of a non-Kekulé polycyclic benzenoid hydrocarbon.

Chemical Science5 (5), DOI: /c3sca. Ranber Singh. Unexpected magnetism in nanomaterials. A mathematical process of enumeration of Kekule structures of any polybenzenoïd monoradical having only linear assemblies of benzenoid hydrocarbons is given by using a method which consisted of the excision of the radical center in order to obtain a conjugated hydrocarbon having a annulene core ring appended to one or more polybenzenoïd fragments, the partition of the.

An Introduction to the Chemistry of Benzenoid Compounds is an introductory text to some chemical aspects of benzenoid compounds. This book is composed of 13 chapters that specifically cover the sources, properties, and reactions of these compounds.

From fig. 1 we conclude that even an approach as simple as (9) yields a reliable estimate of the A-value of random benzenoid chains.

Kekule structure count in benzenoid chains with a fixed number of hexagons of type A We first examine the case of phenes i.e.

un- branched catacondensed benzenoid hydrocarbons with only one hexagon of type A. Search within book. Front Matter. PDF. Benzenoid hydrocarbons in space: The evidence and implications. Louis J. Allamandola. Pages The distortive tendencies of delocalized π electronic systems.

Benzene, cyclobutadiene and related heteroannulenes The existence of Kekulé structures in a benzenoid system. The agreement between Clar structures and nucleus-independent chemical shift values in pericondensed benzenoid polycyclic aromatic hydrocarbons: an application of the Y-Rule.

Phys. Chem. A– /jpq [Google Scholar] Samorí P., Fechtenkötter A., Jäckel F., Böhme T., Müllen K., Rabe J. Purchase An Introduction to the Chemistry of Benzenoid Compounds - 1st Edition. Print Book & E-Book. ISBNHydrocarbon - Hydrocarbon - Structure and bonding: In the German chemist August Kekule von Stradonitz suggested the cyclic structure for benzene shown above.

Kekule’s structure, while consistent with the molecular formula and the fact that all of the hydrogen atoms of benzene are equivalent, needed to be modified to accommodate the observation that disubstitution of the ring at adjacent.

The properties of Clar's valence structures for unbranched catacondensed benzenoid systems have been considered. These molecules can be represented as caterpillar trees, i.e. ayclic graphs with side branches of length one only.

The sextet polynomials of the benzenoids are simply related to the characteristic polyno. An efficient algorithm leading to the Fries canonical structure is presented for benzenoid hydrocarbons.

This is a purely topological approach, which is based on adjacency matrices and the Hadamard procedure of matrix multiplication.

The idea is presented for naphthalene, as an example. The Fries canonical-structures are also derived for anthracene, coronene, triphenylene, phenanthrene. In the last hundred years benzenoid hydrocarbons have constantly attracted the attention of both experimental and theoretical chemists.

In spite of the fact that some of the basic concepts of the theory of benzenoid hydrocarbons have their origins in the 19th and early 20th century, research in this area is still in vigorous expansion.

The present book provides an outline of the most important. In spite of the fact that some of the basic concepts of the theory of benzenoid hydrocarbons have their origins in the 19th and early 20th century, research in this area is still in vigorous expansion.

The present book provides an outline of the most important current theoretical approaches to benzenoids.We have obtained three-component systems: the complexes comprising of two different benzenoid hydrocarbons together with one molecule of 7,7,8,8-tetracyanoquinodimethane (TCNQ).

The X-ray single-crystal structures of naphthalene–perylene–TCNQ and pyrene–perylene–TCNQ revealed that they form face-to-face stac.Nomenclature, structure, properties Nomenclature and structure. By definition, polycyclic aromatic hydrocarbons have multiple cycles, precluding benzene from being considered a PAH.

Naphthalene, with its two rings, is considered the simplest polycyclic aromatic hydrocarbon by US EPA and CDC for policy contexts. Other authors consider PAHs to start with the tricyclic species phenanthrene and.