Alkyl-Substituted Benzenes Homologous

The examples of C6o dissolution in benzene derivatives considered in the present work evidence the clear dependence of C6o solubility on the electron density distribution in the benzene ring. We have identified a priori the electron density with the distribution of ortho-, meta-, para-isomers which form in the reactions of electrophilic substitution of the benzene derivative considered. This identification is evaluated but in some cases, such as in a series of homologs for alkyl derivatives of benzene, the total agreement between the C6o solubility and the amount of ort/io-isomers is observed (Table 2 and Fig. 7). 

Fig. 11. Long chain alkyl aromatic normal patterns have a full homologous series, (a) Shublik A source rock Prudhoe Bay Field long chain alkyl benzenes, (b) Shublik A long chain alkyl toluenes, (c) Kuparuk River Field oil stained core 3B-14 well long chain alkyl benzenes, (d) 3B-14 long chain alkyl toluenes. Numbers designate carbon numbers p is phytanyl-substituted aromatic asterisk designates background fragment peaks. Note, toluenes have ortho, meta and para isomers for each carbon number.

There are both gas- and liquid-phase data for toluene and the n-alkyl substituents ethyl, propyl, butyl, pentyl (liquid only), and decyl. Since these constitute a classic homologous series, we derive eqs 15 from a weighted least-squares analysis where hr is the number of carbon atoms in the substituent group. For most homologous series, n-RZ, the methyl-substituted derivative CH3Z is an outlier from tiie otherwise straight line. In the case of the n-alkyl benzenes, the correlation (r > 0.9998) is not im-... 

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