Condensed aromatic hydrocarbons complexes with

Irritating and lachrymatory agents are generally stable or very slowly decomposed by water. Further, solvents used to disperse these agents are generally insoluble in water and will help prevent interaction of the agent with water. However, should hydrolysis occur, decomposition products may include HCl, HCN, hydrogen bromide (HBr), and/or aromatic hydrocarbons, as well as complex condensation products. 

On the other hand, to accelerate alcoholysis of NaH and KH in solutions of benzene or THF [22.1] - [2.22] - ctyptands are used (which bind alkaline metal into a rather stable chelate complex) [1004], Quite stable, volatile per-fluorotert-butoxides were first obtained in reactions of LiH or NaH with (CF3)3COH they distill at atmospheric pressure at 218 and 232°C, respectively [467] (the application of metals would presumably lead in this case to condensation of Wurtz type). Li and Na hydrides are used as cheaper than metal raw materials for production of the corresponding metal alkoxides. In particular it has been suggested that the equipment used in production of MH could be cleaned from its residue by the mixture ofEtOH and the aromatic hydrocarbon (40 to 60% by volume). After hydrogen evolution is completed the solvent is eliminated under vacuum at < 90°C the residue is MOEt with the content of the main product > 98% [342],... 

Creosote. The major portion of creosote is derived from coal and is a complex mixture of aromatic hydrocarbons with condensed ring systems. The remaining components are tar acids, which are phenolic derivatives of these compounds, and tar bases, which are heterocyclic compounds containing nitrogen plus some neutral oxygenated compounds. At least 200 chemical compounds have been identified in coal-tar creosote, but many of these are present in small amounts. The chemical composition is variable, but some idea of a typical creosote is given in Table I (2). 

As pointed out in Vol. 1, irinitrobenzene and its derivatives possess the ability to form addition compounds, especially with aromatic hydrocarbons composed of condensed rings, such as naphthalene, anthracene, phenanthrene, acenaphthene etc. Addition compounds of picric acid have been known since 18S8 [82] and those of sym-trinitrobenzene since 1882 [83]. Complexes of sym-trinitro-benzene with aromatic amines were also described in 1882 [84]. 

It is interesting to note that the temperature range, in which considerable sharpening of the absorption occurs, coincides with the temperature in which rapid growth of the graphite planes takes place in cellulose (7). Sharpening of the electron-resonance absorption with extent of aromatic condensation has also been demonstrated in the case of potassium complexes of aromatic hydrocarbons (5). 

The results of these determinations for 22 elements on 88 crude oils were subjected to factor analysis, which is a statistical technique designed to explain complex relations among many variables in terms, of a few factors which themselves represent simpler relations among fewer variables. Factor analysis only determines the relations it does not explain them. The explanation of the factors must be in the context of known information about the variables. Hitchon and Gawlak have used factor analysis in the study of aromatic hydrocarbons in gas condensates from Alberta and their paper includes pertinent background information with particular application to geochemical problems. 

Polycyclic aromatic hydrocarbons (PAHs) are a class of organic micropollutants containing two or more condensed rings. Apart from those cases associated with oil pollution, PAHs are produced mainly by anthropogenic combustion and are typically found in the environment as complex mixtures. However, not all components exhibited the same level of toxicity, and congener-specific determination has again become mandatory. 

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