1, 4-Dimethyl-2-isopropylbenzene

Methylenebis(oxy) ]bis(2-chloroformaldehyde), see Bis (2-chloroethoxy) methane Methylene chlorobromide, see Bromochloromethane Methylene dichloride, see Methylene chloride Methylene dimethyl ether, see Methylal Methyl 2,2-divinyl ketone, see Mesityl oxide Methylene glycol, see Formaldehyde Methylene glycol dimethyl ether, see Methylal Methylene oxide, see Formaldehyde Methyl ethanoate, see Methyl acetate (1 -Methylethenyl)benzene, see a-Methylstyrene Methyl ethoxol, see Methyl cellosolve 1-Methylethylamine, see Isopropylamine (l-Methylethyl)benzene, see Isopropylbenzene Methylethyl carbinol, see sec-Bntyl alcohol Methyl ethylene oxide, see Propylene oxide ds-Methylethyl ethylene, see cis-2-Pentene frans-Methylethyl ethylene, see frans-2-Pentene Methyl ethyl ketone, see 2-Bntanone Methylethylmethane, see Butane... 

Among the classes of compounds in crude oil, the alkanes, cycloalkanes, and aromatic fractions contain compounds that are volatile and are described in more detail in this chapter. The NSO compounds, resins and asphaltenes, and organometalhc compounds are nonvolatile and, in general, are less mobile in the environment. A discussion of these compounds is beyond the scope of this chapter. Examples of some of the volatile hydrocarbons present in cmde oil for the major compound classes are shown in Figure 6. Benzene, toluene, xylenes, ethylbenzene, isopropylbenzene, naphthalene, methyl- and dimethyl-naphthalenes are among the most important volatile aromatic hydrocarbons, because they are widely used and, once released into the environment, their mobility and toxicity make them a significant environmental threat (Merian and Zander, 1982). The occurrence of these compounds in the environment is almost exclusively anthropogenic, with the exception of natural hydrocarbon seeps. 

Synthesis of biaryl compounds is not the only use for oxidative dimerization it can lead to formation of new carbon-carbon bonds also in the aliphatic series. These reactions have been carried out with peroxides, especially diacetyl peroxide, for example, the formation of 2,3-dichlorosuccinic acid from chloro-acetic acid and of 2,3-dimethyl-2,3-diphenylbutane from isopropylbenzene 291 and hydrogen peroxide292 and a mixture of ammonium persulfate and sodium... 

C-Methylation of ketones. Various ketones (and some aldehydes) aregem-dimethylated by trimethylaluminum in a hydrocarbon solvent at 120-180°. Yields range from moderate to high. 3-Cholestanone can be converted into 3a-methylcholestane-3j3-ol or exhaustively methylated to 3,3-dimethylcholestane. Benzaldehyde is converted quantitatively into isopropylbenzene. Anthrone is converted into 9-methylanthracene. As before, the main side reaction is dehydration to olefin by-products. 

The initial distribution of C4-benzene and C4-naphthalene compounds is different for the original WCSB oil and the Fort Worth Basin oils (Tables 2 and 3). The 1,2,3,5-tetramethylbenzene isomer is most abundant relative to the other two isomers in the Fort Worth Basin oils whereas the 1,2,3,4-tetramethylbenzene isomer is most abundant in WCSB oil. The l,3-dimethyl-5-ethylbenzene and the 1,2-dimethyl-4-ethylbenzene isomers are most abundant and next most abundant in the WCSB and Fort Worth Basin oils when measured as a fraction of the total dimethylethylbenzenes. The 1-methy 1-4-isopropylbenzene isomer is most abundant in the WCSB and Fort Worth Basin oils relative to the other two isomers. However, 1-methy 1-2-isopropylbenzene, the next most abundant isomer in both oils is more abundant relatively in the WCSB oil than in the Fort Worth Basin oils. The 1,3,6,7-TeMN isomer is most... 

Negadi, L. Ghanem, G. Ait-Kaci, A. Jose, J. Static measurements of the total vapor pressure of binary mixtures of dimethyl carbonate with benzene or isopropylbenzene at temperatures between 273 and 373 K ELDATA Int. Electron. J. Phys.-Chem. Data 1997,5,53-62... 

---