Aromatic hydrocarbon

About: Aromatic hydrocarbon is a research topic. Over the lifetime, 5814 publications have been published within this topic receiving 55499 citations. The topic is also known as: arene & arenes.

Ionization Potentials of Polycyclic Aromatic Hydrocarbons

Abstract: DIRECT determination of ionization potential by means of the photo-ionization1 or the electron impact2 has been carried out with only a few polycyclic aromatic hydrocarbons. According to a simple molecular orbital theory the ionization potential bears a linear relationship to the frequency of the absorption band corresponding to the excitation of a π-electron from the highest occupied orbital to the lowest vacant orbital. On this theoretical base, Matsen3 proposed an empirical formula: where the constants were determined so as to give the known ionization potential of graphite, 4.39 eV (ref. 4), and that of naphthalene, 8.12 eV1, at hν = 0 and 4.53 eV, respectively. He estimated the ionization potential for a number of polycyclic aromatic hydrocarbons using the observed frequencies of the p-band. These values have been used often when the ionization potential of a relatively large aromatic hydrocarbon was required.

Aromatic hydrocarbon derivatives of fullerences

Abstract: The fullerences C60 and C70 form adducts with toluene, p-xylene and other aromatic compounds when refluxed in these solvents in the presences of FeCl3. Benzene derivatives are produced only when bromine is also present. Mass spectra of the reaction mixtures indicate the presence of derivatives including 1:1 adducts, as well as products of multiple additions of the aromatic molecules and their dehydrogenation products. Tandem mass spectrometry provides evidence for CC bonds formation between the adducts and fullerences.

On the Catalytic Cyclization of Aliphatic Hydrocarbons. I

Abstract: The aromatization of a paraffin proceeds through the formation of a mono-olefine which is held on the catalyst by two-point contact. The promoter action of the central atoms in heteropoly acids of molybdenum can be attributed to the stabilization of the molybdenum dioxide produced during the hydrogen pretreatment. The alumina used as a support for molybdenum catalysts plays the same role. In the reduction of phenol to benzene by the heteropoly acids of molybdenum the metal is the catalyst. The variation of yield of the total aromatic hydrocarbon with different paraffin feeds can be calculated by assuming two point contact. A yellow compound (fulvene or a polymer of fulvene) is for given conditions produced in a constant ratio to the aromatic hydrocarbon. The loss of activity of the catalyst with use is a result of the polymerization to giant molecules of the hydrocarbons adsorbed on adjacent catalyst centres. This decay rate may be diminished by decreasing the concentration of active centres on the surface.

Diglycidyl substituted heterocyclic compounds

Abstract: Diclycidyl substituted heterocyclic compounds of the formula: wherein X and Y can be the same or different and are either nitrogen or the radical C-R, where R is a hydrogen, or a hydrocarbon group, eg, a straight or branched chain saturated or unsaturated hydrocarbon group, a substituted or unsubstituted cycloaliphatic group, an aromatic hydrocarbon-substituted alkyl group, a cycloaliphatic hydrocarbon-substituted alkyl group, an aromatic hydrocarbon group, a heterocyclic group, or a hetero-cyclic-substituted alkyl group, and where the glycidyl group in the five-membered ring is attached to a ring nitrogen atom; processes for their preparation; and compositions and methods for their use as cytostatic agents