Polycyclic Hydrocarbons
Volume 1
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Chapter
Die Zentralalpen östlich der Katschberglinie
Wo die Gesteine der Schieferhülle am Ostrand des Tauernfensters unter das Unterostalpin der Linie Katschberg—Gmünd, markiert durch auf der Karte von M.F.Buchroithner (1984) ausgewiesene Hauptstörungen, abtauchen,...
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Article
Das vertikale Problem
An verschiedenen Anomaliearten wurden die vertikalen Verhältnisse im Frontzahngebiet untersucht. Das Untersuchungsmaterial bestand aus Anfangsmodellen und den dazugehörigen Fernröntgenaufnahmen.
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Article
Literatur: Neue Bücher
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Article
Literatur: Neue Bücher
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Book
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Book
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Chapter
The Tautomerism of Phenols
There is an increasing tendency to stabilize the dihydro structures in higher acenes. If phenols ketonize they transform their aromatic skeleton into the dihydro skeleton. Therefore the keto form must become t...
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Chapter
Hydrocarbons derived from 2.3,7.8-Di-(peri-naphthylene)-pyrene
Pyrene (I) can be condensed twice with 1-bromonaphthalene in a sodium chloride—aluminium chloride melt to give 2.3,7.8-di-(peri-naphthylene)-pyrene which is separated from by-products by sublimation.1 ...
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Chapter
The Electrical Conductivity of Aromatic Hydrocarbons
Graphite, the most highly condensed aromatic system, is a good conductor. This electrical conductivity originates in the mobility of the π-electrons in the molecular planes. In accordance with this the conduct...
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Chapter
Carbon Atoms, p-Electrons and Hybridization
In wave mechanics, Bohr orbits are replaced by electron clouds. Thus an s-electron is represented by an electron cloud surrounding the nucleus and having a maximum intensity described by a ball or shell as indica...
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Chapter
Hydrocarbons derived from Quaterrylene
Two molecules of perylene (I) condense in a sodium chloride—aluminium chloride melt at 150° to form quaterrylene (II) and a more readily soluble hydrocarbon as by-product.1
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Chapter
Quinquiphenyl and Sexiphenyl
Quinquiphenyl and other polyphenyls are formed by reduction of benzenediazonium sulphate in concentrated sulphuric acid and acetic acid with formic acid and copper powder.1 A mixture of 4-iododiphenyl, 4-iodoterp...
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Chapter
Hydrocarbons Containing Four Five-membered Rings
Diacenaphthylidene (I) is dehydrogenated by benzoquinone to (II) and two molecules of this resulting diene (II) condense with one molecule of benzoquinone to form the quinone (III).’
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Chapter
Hydrocarbons derived from Anthanthrene
Anthanthrene cannot be formulated with more than two benzenoid rings, each having one aromatic sextet as shown in formula (IV). It appears correct therefore to derive it in the same way from pyrene as anthrace...
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Chapter
Hydrocarbons derived from Terrylene
1-Naphthyl magnesium bromide reacts with 2, 3-dichloro-1,4-naphthoquinone (I) to yield the diol (II). This is reduced to dinaphthyldichloronaphthalene (III) in boiling acetic acid with hydriodic acid. Cyclizat...
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Chapter
Magnetic Properties of Aromatic Hydrocarbons
Hydrocarbons with paired electrons are diamagnetic. This means they are repelled in a magnetic field. This repulsion can be measured with a magnetic balance (Gouy’s method). The diamagnetic susceptibilities ar...
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Chapter
Nomenclature of Polycyclic Hydrocarbons
There has never been any difficulty about the nomenclature of benzene and naphthalene derivatives. However, it was decades before a practical system for higher polycyclic hydrocarbons was developed. These latt...
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Chapter
The C—C Bond Length in Polycyclic Hydrocarbons
The most important method for determining the C—C bond length in polycyclic hydrocarbons is X-ray analysis. When applied to benzene the length of a hexagon side was found to be 1·392 Å.1 If benzene were formed by...
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Chapter
The C=C Double Bond and Conjugation in Butadiene
Another method of hybridization is the combination of a 2s-electron with two 2p-electrons. The sp 2 hybridization of the electrons of the two C-atoms forms the four C—H bonds plus the C—C single bo...
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Chapter
Hydrocarbons derived from Quaterphenyl
Quaterphenyl is formed by pyrolysis if benzene is distilled through a glowing iron tube1 or over an electrically heated wire.2 4-Bromodiphenyl and sodium yield quaterphenyl3 as well as 4-iododiphenyl with copper ...
