The chemcial mechanism for formatin of electronically excited-state molecules from the thermal reaction of dimethyldioxetanone was studied. Light production in the presence of certain easily oxidized aromatic hydrocarbons was found not to conform to the classical mechanistic schemes for chemiexcitation. Detailed investigation of the dioxetanone system revealed light formation by the recently di...

The number of resonance structures (SC) for previously published concealed non-Kekuléan benzenoid hydrocarbons is determined. Using a simple computer program, analytical expressions for determining SC for various classes of non-Kekuléan (free-radical) benzenoid hydrocarbons are derived, and some properties of concealed non-Kekuléan benzenoid hydrocarbons are studied.

Chemical analyses revealed that in Cataglyphis niger both the hemolymph and the crop contain the same hydrocarbons that are found in the postpharyngeal gland (PPG). On the cuticle, on the other hand, alkanes, and in particular nonacosane, were more abundant than in the PPG. Studies of their biosynthesis in vivo, using intact ants, revealed the presence of newly synthesized hydrocarbons in both ...

Catalytic thermolysis is considered to be an effective process for viscosity reduction, the conversion of high-molecular components oil (resins and asphaltenes) into light hydrocarbons, desulfurization hydrocarbons. In this paper, we conducted non-catalytic catalytic a heavy sample isolated from Ashalcha field (Tatarstan, Russia) at temperature 250 °C. Fullerene C60 nanoparticles were applied p...

Purpose The purpose of this memorandum is to document the conversion factors for reporting hydrocarbon emissions in different forms. The general forms are total hydrocarbons (THC), total organic gas (TOG), nonmethane hydrocarbons (NMHC), nonmethane organic gas (NMOG), and volatile organic compounds (VOC), all defined in the introduction below. For reporting hydrocarbon emissions from nonroad eq...

The aqueous solubilities of a set of 109 hydrocarbons and 132 halogenated hydrocarbons (total 241) are correlated by a three term equation using descriptors calculated solely from molecular structure, with a correlation coefficient (R) of 0.979 and a standard error (s) of 0.386 log units. This equation allows the estimation of aqueous solubilities of hydrocarbons and halogenated hydrocarbons (i...

Abstract The tandem catalytic functionalization/carboxylation of double as well triple carbon‐carbon bonds with CO 2 represent an emerging research area in synthetic organic methodology. In particular, the combination mild reaction conditions, stoichiometric acceptor/donorless conditions (visible light photoredox catalysis) and chiral catalysts contributed to a rapid development this intriguing...

VASELINE oil intoxication is a known cause of exogenous lipoid pneumonia. Vaseline oil is a mixture of saturated aliphatic (C14–C18) and cyclic hydrocarbons that is insoluble in water and, in the alveolar space, activates an acute inflammatory response with edema and interstitial fibrosis. Because the hydrocarbons cannot be metabolized in humans, the therapy consists of limiting or decreasing t...

The direct conversion of methane to C2 hydrocarbons, in a quartz tube reactor enforced by a DC corona discharge, was investigated at atmospheric pressure. The process was carried out in the presence of metal oxide catalysts of Mn/W/SiO2, Mn/W/SiO2 (tetraethyl orthosilicate, TEOS), and Mn/W/CNT (supported on carbon nanotubes). The total yield to C2 hydrocarbons in the presence of metal oxide cat...