“…132 DMS has been extensively employed in GLC as one of the best solvents for the separation of multicomponent hydrocarbon mixtures and some oxygen-containing compounds. [133][134][135] At higher operating temperatures sulfolane can be replaced by other polar phases of high selectivity, e.g., trimethyltetramethylene sulfone 112 and 2-methylpiperazine diformamide. 136 Tetrahydrofurfuryl acetate, 137 tetrahydrofuryl phosphate, 138 0-indolylacetonitrile, 131 hexa(ß-hydroxyethyl)melamine, 139 dibenzylpyridine, 140 7-lactone of galactonic acid, 103 · 141 etc.…”