Room-temperature ionic liquids are salts that are liquid at room temperature. Their use as catalysts and catalytic support has been studied extensively. However, there are very few measurements on their solubility and phase equilibria in common organic solvents. In this work, the liquid-liquid phase equilibria of mixtures of room-temperature ionic liquids, 1-alkyl-3-methylimidazolium hexafluorophosphate, [R n mim][PF 6 ] (1) where R n ) butyl, pentyl, hexyl, heptyl, and octyl, with butan-1-ol (2) over a composition range have been measured. The binodal coexistence curves of the mixtures were found to have an upper critical solution temperature (USCT) at x 2 ≈ 0.9. The UCST decreases with increase in the length of the alkyl chain of the ionic liquid, with the UCST of the butyl at 373 K and that of the octyl at 326 K. Both the UCST and the composition at the UCST as a function of the 1-alkyl group chain length can be reasonably well predicted from theory on the basis of unimolecular quantum chemical calculations.

In the presence of a catalytic amount of ytterbium (III) trifluoromethanesulfonate [Yb(OTf)3], 1-methylpyrrole can easily react with acyl chlorides in an ionic liquid [bpy][BF4](bpy=1-butylpyridine) to form corresponding ketones in satisfactory yield. The recyclability of the ionic liquid/catalyst system is demonstrated

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Liquids. -The efficient and environmentally acceptable synthesis of dihydroquinolines (III) (9 examples) is carried out via a modified and improved Skraup reaction. -(LI, Y.; WU, C.; HUANG, J.; SU*, W.; Synth.

Liquid. -The solvent/catalyst system can be easily recovered and reused without significant loss of catalytic activity. -(SU, W.; WU, C.; SU, H.; J. Chem. Res. 2005, 1, 67-68; Coll. Pharm. Sci., Zhejiang Univ. Technol.,