Alkyl benzene standards values

Table 14-2. Values of Heats of Formation and of Standard Free Enerot of Formation for Several Alkyl Benzenes fob the Ideal Gaseous State ...

The coefficients of the individual groups were elose to 1. The order of the MIFS values was alltyl alcohols > alltyl benzenes > PAHs > alkanes. If the relationship between alkane log k values and their MIFS values is considered as the standard for in silica analysis and the retention is based on a hydro-phobic interaction, the retention of other types of eompounds should follow the relationship of the alkanes. The retention strength was as follows alkanes > PAHs > alkyl benzenes > alkanes, based on the MI energy values. The van der Waals energy values support the strength of hydrophobic retention. If their solvation mechanisms are the same, all eompounds should... 

Figure 8.6 shows some data measured for benzene solubilized in hexadecyl pyridinium chloride. The abscissa in the figure shows the extent of solubilization expressed as moles of solubilizate per mole of surfactant. The ordinate values show shifts in the resonance frequencies from water taken as an internal standard. Shifts of peaks arising from protons in the pyridinium ring, in benzene, and in methylene groups in the alkyl tail are shown versus the extent of solubilization. 

Vitride reagent (0.5 mL) is added to the lipid (1 to 10 mg) in diethyl ether-benzene (2.5 mL 4 1, v/v) in a test-tube, and the solution is heated with occasional shaking for 30 min at 37°C. On cooling, water-ethanol (10 mL 5 1,v/v) is added cautiously, then the products are extracted with diethyl ether (3 x 6 mL portions) hexane (10 mL) is added and the solution is dried over anhydrous sodium sulfate. After filtering, the solvent is removed from the combined extracts in a rotary evaporator. The samples are dissolved in a little chloroform and applied to a silica gel G TLC plate, which is developed in diethyl ether-hexane (4 1, v/v). The products are identified by their Rf values relative to standards, alkyl ethers migrating just ahead of the alk-1-enyl analogues, and they are eluted from the adsorbents with several volumes of diethyl ether."... 

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