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.

Genetic differences in the aromatic hydrocarbon-inducible n-hydroxylation of 2-acetylaminofluorene and acetaminophen-produced hepatotoxicity in mice.

Abstract: The genetically mediated presence or absence of induction, as well as the magnitude of induction, of aryl hydrocarbon (benzo[ a ]pyrene) hydroxylase activity is highly correlated ( p N -hydroxylation of 2-acetylaminofluorene in the livers of C57BL/6N and DBA/2N inbred mice treated with the microsomal enzyme inducers 3-methylcholanthrene, β-naphthoflavone, 2,3,7,8-tetrachlorodibenzo- p -dioxin, and sodium phenobarbital. The extent of hepatotoxicity caused by acetaminophen ( p -hydroxyacetanilide) administered intraperitoneally to these two strains of mice is also highly associated with both aromatic hydrocarbon-inducible monooxygenase "activities": aryl hydrocarbon hydroxylase and acetylarylamine N -hydroxylase. We suggest that cytochrome P 1 450 is involved with the aromatic hydrocarbon-inducible N -hydroxylase activity and that these genetic differences among inbred strains of mice offer a valuable experimental model system for studying the mechanism of hepatotoxicity and carcinogenicity among siblings of a defined genotype.

Oxidation of biphenyl by a multicomponent enzyme system from Pseudomonas sp. strain LB400.

Abstract: Pseudomonas sp. strain LB400 grows on biphenyl as the sole carbon and energy source. This organism also cooxidizes several chlorinated biphenyl congeners. Biphenyl dioxygenase activity in cell extract required addition of NAD(P)H as an electron donor for the conversion of biphenyl to cis-2,3-dihydroxy-2,3-dihydrobiphenyl. Incorporation of both atoms of molecular oxygen into the substrate was shown with 18O2. The nonlinear relationship between enzyme activity and protein concentration suggested that the enzyme is composed of multiple protein components. Ion-exchange chromatography of the cell extract gave three protein fractions that were required together to restore enzymatic activity. Similarities with other multicomponent aromatic hydrocarbon dioxygenases indicated that biphenyl dioxygenase may consist of a flavoprotein and iron-sulfur proteins that constitute a short electron transport chain involved in catalyzing the incorporation of both atoms of molecular oxygen into the aromatic ring.

Polymer compound and polymer light-emitting element using the same

Abstract: PROBLEM TO BE SOLVED: To provide a new polymer compound having high emission intensity. SOLUTION: The polymer compound comprises a repeating unit represented by formula (1) or (2) [(in formula 1, Ar 1 and Ar 2 are each a trivalent aromatic hydrocarbon group or trivalent heterocyclic group; X 1 and X 2 are each O, S, C(=O) or the like excluding the case that X 1 and X 2 are the same; X 1 and Ar 2 bond to adjoining carbon atoms in the aromatic ring of Ar 1 , and X 2 and Ar 1 bond to adjoining carbon atoms in the aromatic ring of Ar 2 ) and (in formula 2, Ar 3 and Ar 4 are each a trivalent aromatic hydrocarbon group or trivalent heterocyclic group; X 3 and X 4 are each N, B, P or the like excluding the case that X 3 and X 4 are the same; X 3 and Ar 4 bond to adjoining carbon atoms in the aromatic ring of Ar 3 , and X 4 and Ar 3 bond to adjoining carbon atoms in the aromatic ring of Ar 4 )]. COPYRIGHT: (C)2004,JPO

Method for producing aromatic alcohols, especially phenol

Abstract: The invention relates to a method for the production of phenol derivatives by performing catalytic oxidation of an aromatic hydrocarbon to obtain a hydroperoxide and subsequently cleaving the hydroperoxide into a phenol derivative and a ketone in the presence of a radical starter, wherein a compound of formula (I) is used as oxidation catalyst, wherein R1, R2 = H, an aliphatic or aromatic alkoxy radical, a carboxyl radical, an alkoxycarbonyl radical or a hydrocarbon radical, with 1 to 20 carbon atoms, SO?3?H, NH2, OH, F, Cl, Br, I and/or NO2, wherein R?1 and R2? represent identical or different radicals or R?1 and R2? may be linked to one another by a covalent bond, wherein X, Z = C, S, CH?2;? Y = O, OH; k = 0, 1, 2; l = 0, 1, 2 and m = 1 to 3; wherein the molar ratio between the catalyst and the aromatic hydrocarbon is less than 10 mol %.

Catalytic pyrolysis of pinewood over ZSM-5 and CaO for aromatic hydrocarbon: Analytical Py-GC/MS study

Abstract: A higher amount of oxygenates is the main constraint for higher yield and quality of aromatics in catalytic pyrolysis while a study of hydrocarbon production with a balance of reactive species lies importance in the catalytic upgrading of pyrolytic vapor. Catalytic pyrolysis of pinewood sawdust over acidic (ZSM-5) and basic (CaO) catalyst was conducted by means of Py-GC/MS to evaluate the effect of biomass to catalyst loading ratio on aromatic hydrocarbon production. Catalytic pyrolysis with four different biomass to catalyst ratios (0.25:1, 0.5:1, 1:1, and 2:1) and non-catalytic pyrolysis were conducted. It has been obtained that ZSM-5 showed better catalytic activity in terms of a high fraction of aromatic hydrocarbon. The ZSM-5 catalyst showed a potential on the aromatization as the yield of aromatic hydrocarbon was increased with a higher amount of ZSM-5 catalyst and the highest yield of aromatics (42.19 wt %) was observed for biomass to catalyst ratio of 0.25:1. On the other hand, basic CaO catalyst was not selective to aromatic hydrocarbon from pinewood sawdust but explored high deacidification reaction in pyrolytic vapor compared to ZSM-5 catalyst, whereas non-catalytic pyrolysis resulted in acidic species (13.45 wt %) and phenolics (46.5 wt %). Based on the results, ZSM-5 catalyst can only be suggested for catalytic pyrolysis of pinewood sawdust for aromatic hydrocarbon production.