Hydrocarbons naphthalene

Oscik and Chojnacka [63] use TEC adsorption in the investigation of six aromatic hydrocarbons (naphthalene, diphenyl, anthracene, pyrene, chrysene, and acenaphthene) on silica gel G by elution with different binary mobile phases (trichloroethylene-benzene, carbon tetrachloride-benzene, n-heptane-trichloroethylene. 

Different aromatic hydrocarbons (naphthalene, pyrene and some others) can form excimers, and these reactions are accompanying by an appearance of the second emission band shifted to the red-edge of the spectrum. Pyrene in cyclohexane (CH) at small concentrations 10-5-10-4 M has structured vibronic emission band near 430 nm. With the growth of concentration, the second smooth fluorescence band appears near 480 nm, and the intensity of this band increases with the pyrene concentration. At high pyrene concentration of 10 2 M, this band belonging to excimers dominates in the spectrum. After the act of emission, excimers disintegrate into two molecules as the ground state of such complex is unstable. 

All these condensed aromatic hydrocarbons, naphthalene 12, anthracene 13, biphenylene 14, and fluorene 15, were found to undergo further two-electron... 

The pitch of coal tar is the black or dark brown amorphous residue that remains after the redistillation process. The volatiles contain a large quantity of lower molecular weight polycyclic hydrocarbons. As these hydrocarbons (naphthalene, fluo-rene, anthracene, acridine, phenanthrene) sublime into the air there is an increase of benzo(polycyclic hydrocarbons in the tar and in the fumes. Polycyclic hydrocarbons, known to be carcinogenic, are of this large molecular type. 

Thermochemical data are available (Ref 2) on the heats of combustion and formation for all five isomers, on the heats of nitration from various Dinitrotoluenes for the 23,4-, 2,4,5-, and 2,3,6-isomers, and on the heats of crystn for the 2,3,4- and 2,4,5-isomers. Data are also available (Ref 1) on the shock sensitivities of all of the isomers except 2,3,6-, and on the rates of decompn at 140° of the 23,4-, 2,4,5-, and 23,5-isomers. The detonation pressure and the temp coefficient of decompn between 140 and 180° have been measured for the 2,4,5-isomer 2,3,4- and 2,4,5-TNT form addition compds ( 7r-complexes ) at 1 1 molar ratio with several polycyclic aromatic hydrocarbons (naphthalene, acenaphthene, fluorene, phenanthrene and anthracene) (Ref 2). 2,4,5-TNT forms complexes with 4-aminozaobenzene, 4-aminoacetophenone, bis (2 hydroxy ethyl) amine, and tris (2-hydroxy-ethyl) amine (Ref 1). The first two have a 1 1 molar ratio, the third 1 2, and the fourth 2 1. Upon heating, the two 4-amino compds react with replacement of the 5-nitro group, as discussed below... 

Know the meaning of polycyclic aromatic hydrocarbon, naphthalene, anthracene, phenanthrene, carcinogenic, graphite, fullerene. 

The diazines (pyridazine, pyrimidine, and pyrazine) are six-membered aromatic heterocycles that have two nitrogens in the ring. Cytosine, thymine, and uracil are derivatives of pyrimidine that are important bases in nucleic acids (DNA and RNA). Heterocyclic analogs of the aromatic hydrocarbon naphthalene include pteridines, which have four nitrogens in the rings. Naturally occurring pteridine derivatives include xanthopterin (a pigment) and folic acid (a vitamin). Methotrexate is a pteridine used in cancer chemotherapy. 

Polyaromatic hydrocarbons (naphthalene, fluorene, phen-anthrene, pyrene, benz[a]anthracene Linear polymer coated capillary [poly(N-tert.-butyl acrylamide-co-2-acrylamido-2-methyl-1 -propanesulfonic acid] Acetonitrile-50 mA/Tris buffer, pH 7.3 (30 70) 600 mm x 25 pm i.d. 450 mm effective column length 11... 

Polyaromatic hydrocarbons (naphthalene, fluorene, anthracene, pyrene), acetone... 

Aromatic hydrocarbons (naphthalene, 2-methyl-naphthalene, fluorene, phenanthrene, anthracene)... 

Polynuclear aromatic hydrocarbons (naphthalene, phenanthrene, pyrene), thiourea... 

Also, the PET between polynuclear aromatic hydrocarbons (naphthalene, anthracene, phenanthrene, perylene) or heteroaromatics (phenazine, acridine) as acceptors and amines as donors can be used for polymerization initiation of AN and alkyl methacrylates [111-113]. In general, a reaction course as outlined in Scheme 3 also acts with these combinations. 

Chromophore quencher systems where the organic molecular components are aryl hydrocarbons are under intense study [67, 190-205], In these systems an inorganic moiety (based on polypyridine complexes of Ru(II), Os(II), Re(I)) and an aryl hydrocarbon (naphthalene, anthracene, pyrene) are covalently linked by flexible aliphatic [187-201] or rigid conjugated bridges [49, 190, 191, 193). 

Aerobic Mono-, dichlorobenzenes/benzoates/phenols 2,4-D 2,4,5-T chlorinated abphatic acids BTEX, saturated/unsaturated hydrocarbons, naphthalene, creosote compounds... 

Theories of Formation of Benzene, etc.—Theories of the formation of these benzene products in the distillation of coal have been investigated principally by Berthelot, and his conclusions are, in general In the first place, coal decomposes by heat yielding simple paraffin compounds such as methane, ethylene, acetylene, alcohol, acetic acid, etc. These compounds when subjected to higher temperatures polymerize into benzene, and the higher hydrocarbons naphthalene, anthracene, phenanthrene, etc., and into derivatives of these such as phenol, aniline, pyridine, etc. 

The direct reaction between a radical cation derived from an aromatic hydrocarbon (naphthalene) and SCN has been studied by mixing the salt (CioH8)2PF6 with a solution of BU4NSCN in CH2CI2 at —78 C [158]. Two major products were isolated, 1-naphthylthiocyanate (kinetic control, 28%) and 2-naphthyl-wo-thiocyanate (thermodynamic control, 8%). The mechanistic details leading to this product distribution are not clear. 

Two aromatic rings that share a pair of carbon atoms are said to be fused. In this chapter we shall study the chemistry of the simplest and most important of the fused-ring hydrocarbons, naphthalene, CioHg, and look briefly at two others of formula ChHio anthracene and phenanthrene. 

A valuable goal appears to be the anodic conversion of substituted toluenes into the corresponding aldehydes. The reaction can be achieved either in methanol [194] (intermediate formation of a ketal) or in aqueous solution in an indirect manner (presence of Mm11 or/and Cem ions as mediators [195]). The indirect oxidation of polyaromatic hydrocarbons (naphthalene, anthracene) into the corresponding quinones could be achieved in the presence of electrogenerated ceric ions. 

The reagent forms ir-complexes with flhetive ir base hydrocarbons (naphthalene, anthracene, hexamethylbenzene), which fficll aboiil. 50° higher than Ihe corresponding complexes of 2,4.7-trlnltro5lMlfnonc I hc following order of rr-aci l... 

ISO 15009 2002 Soil quality - Gas chromatographic determination of the content of volatile aromatic hydrocarbons, naphthalene and volatile halogenated hydrocarbons - Purge-and-trap method with thermal desorption. 

Overall, JP-8 air concentrations according to surrogate markers, such as total hydrocarbons, naphthalene, and benzene, appeared to be highest in aircraft fuel tanks, especially those containing explosion-suppression foam (Carlton and Smith 2000 Egeghy and Rappaport 2001). The increased air concentrations appear to result from the tendency of foam to absorb fuel. At elevated temperatures inside the tank, the fuel volatilizes to yield higher air concentrations of JP-8. Fuel tanks with appropriate cross ventilation have much lower interior air concentrations of JP-8. 

International Standards Organisation (2003c) Water quality - gas-chromatographic determination of a number of monocyclic aromatic hydrocarbons, naphthalene and several chlorinated compounds using purge-and-trap and thermal desorption. ISO 15680 2003. 

Like benzene, naphthalene is an aromatic hydrocarbon. Naphthalene has three resonance contributors. 

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