Abstract
Gas chromatographic separation of isomers of mono substituted phenols as their alkyl ether derivatives was studied on liquid crystal stationary phase. Three Schiff's base type liquid crystals such as 4-(p-methylbenzyloxy)benziliden-4'-n-alkylaniline (alkyl; ethyl→MBBE, 1-butyl→MBBB, 1-hexyl→MBBH) were prepared as stationary phases. The temperature ranges of nematic mesophase for MBBE, MBBB, and MBBH were 122140°C, 132147°C, and 132140°C, respectively. A mixture of alkyl ether derivatives from mono-substituted phenols was chromatographed on a column (3 mmφ×2 m or 3 m, stainless steel) packed with 10% liquid crystal at the temperature of nematic mesophase. p-Substituted ether derivatives provided larger retention volume and better selectivity than other isomers. It was found that phenols tested could be quantitatively converted into their ethers with 1-propyl bromide.
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