Summary
The regularities of the retention of polymethyl- and monoalkylbenzenes on a nonpolar adsorbent (silanized silica gel) with a polar eluent (2∶3 isopropanol-water) have been studied. In contrast to the retention of the same compounds on a polar adsorbent (silica gel with hydroxylated surface) and with a nonpolar eluent (hexane) polymethylbenzenes are retained on silanized silica gel for a shorter time than the corresponding monoalkylbenzene isomers. The retention order of tert.-, sec.- and n-butylbenzenes is the reverse of that observed on silica gel having a hydroxylated surface. The retention order of xylenes, trimethyl- and tetramethylbenzenes is also the reverse of their retention order on silica gel having a hydroxylated surface. All the mixtures of the corresponding homologues and isomers have been separated.
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References
A. N. Ageev, A. V. Kiselev andYa. I. Yashin, Doklady Akad. Nauk S.S.S.R.249, 337 (1979).
A. N. Ageev, A. V. Kiselev andYa. I. Yashin, Chromatographia13, 669 (1980).
T. I. Temnikova Kurs Teoretitcheskikh Osnov Organicheskoi Khimii (Theoretical Basis of Organic Chemistry) Khimiya Press, Leningrad 1968.
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Ageev, A.N., Kiselev, A.V. & Yashin, Y.I. Regularities in the retention of isomeric aromatic hydrocarbons in liquid chromatography II. Analysis of polymethyl- and monoalkylbenzenes on silanized silica gel. Chromatographia 14, 638–640 (1981). https://doi.org/10.1007/BF02291103
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DOI: https://doi.org/10.1007/BF02291103