Hydrocarbons benzenoid

The definition of a benzenoid hydrocarbon/benzenoid system/benzenoid graph as well as a sufficient number of examples can be found in the preceding article [1] and elsewhere [12]. We shall not reintroduce the notation and terminology described in [1], except that for the readers convenience we list the most frequently employed symbols. Let BH be a benzenoid hydrocarbon and let B stand for the corresponding benzenoid system/benzenoid graph. Then ... 

A tetracyclic benzenoid hydrocarbon suspected of being a carcinogen. 

Two-Dimensional Representation of Chemical Structures. The lUPAC standardization of organic nomenclature allows automatic translation of a chemical s name into its chemical stmcture, or, conversely, the naming of a compound based on its stmcture. The chemical formula for a compound can be translated into its stmcture once a set of semantic rules for representation are estabUshed (26). The semantic rules and their appHcation have been described (27,28). The inverse problem, generating correct names from chemical stmctures, has been addressed (28) and explored for the specific case of naming condensed benzenoid hydrocarbons (29,30). 

An isomeric system is related to the benzenoid hydrocarbon phenanthrene. Both the [Pg.521]

Gutman and S. J. Cyvin, Introduction to the Theory of Benzenoid Hydrocarbons, Springer-Verlag, Berlin, 1989. 3 Lloyd, Nonbenzenoid Conjugated Carbocyclic Compounds, Elsevier, Amsterdam, 1984. 

The resulting oil is brownish iu coloor with a most unpleasant odour, due to the presence ot decomposition products, which inclnde phenols, furfural, and benzenoid hydrocarbons. 

Klein, D. J. Semiempirical Valence Bond Views for Benzenoid Hydrocarbons. 153, 57-84 (1990). 

Zander, M Molecular Topology and Chemical Reactivity of Polynuclear Benzenoid Hydrocarbons. 153, 101-122 (1990). 

The vast majority of aromatic compounds have a closed loop of six electrons in a ring (the aromatic sextet), and we consider these compounds first. It is noted that a formula periodic table for the benzenoid polyaromatic hydrocarbons has been developed. ... 

For books on this subject, see Gutman, I. Cyvin, S.J. Introduction to the Theory of Benzenoid Hydrocarbons, Springer NY, 1989, Dias, J.R. Handbook of Polycyclic Hydrocarbons, Part A Benzenoid Hydrocarbons, Elsevier NY, 1987, Clar, E. Polycyclic Hydrocarbons, 2 vols. Academic Press NY, 1964. For a periodic table that systematizes fused aromatic hydrocarbons, see Dias, J.R. Acc. Chem. Res., 1985, 18, 241 Top. Curr. Chem., 1990, 253, 123 J. Phys. Org. Chem., 1990, 3, 765. 

Using the above procedure and the A j, values, Binsch has examined the second-order bond fixations in the ground states of linear, cyclic, and benzenoid hydrocarbons and nonalternant hydrocarbons... 

Figure 2. Minimum atomic localization energy in benzenoid hydrocarbons plotted against energy of the highest occupied molecular orbital (HOMO).

The series of benzenoid aromatic hydrocarbons shown in Figure 6 have been studied in the present work, and should allow for an extrapolation towards an... 

Gutman, I. Total n-Electron Energy of Benzenoid Hydrocarbons. 162,29-64 (1992). Guyon, P.-M., Gislason, E.A. Use of Synchrotron Radiation to Study-Selected Ion-Molecule Reactions. 151, 161-178 (1989). 

The important bluish mixing component 11.22 for whitening polyester is made by Friedel-Crafts acylation of pyrene (Scheme 11.17). This tetracyclic hydrocarbon is not unlike anthracene in its susceptibility to substitution reactions. The most stable bond arrangement in pyrene appears to be that shown as form 11.47a, which contains three benzenoid (b) rings. Canonical form 11.47b, containing only two such rings, contributes to a lesser extent (Scheme 11.18). In all monosubstitutions, pyrene is attacked initially at the 3-position, corresponding to the a-positions in anthracene or naphthalene. 

The active component of a carrier formulation is generally a nonionic compound of Mr 150-200 containing a benzenoid ring system. A comprehensive review listed the classes of compounds used together with their general properties, ideal requirements and the mechanisms that have been proposed for carrier action [115]. Carrier compounds fall into four main classes phenols, primary arylamines, aryl hydrocarbons and aryl esters. Major... 

Gutman, I. Total rc-Electron energy of Benzenoid Hydrocarbons. 162, 29-64 (1992). 

Allamandola, L.J. Benzenoid Hydrocarbons in Space The Evidence and Implications. 153, 1-26(1990). 

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