Journal
MONATSHEFTE FUR CHEMIE
Volume 145, Issue 6, Pages 1017-1022Publisher
SPRINGER WIEN
DOI: 10.1007/s00706-014-1150-8
Keywords
Bronsted acid; Ionic liquid; Trioxane; Aldehyde; Cyclotrimerization
Categories
Funding
- Research Project of Fujian Province Education Department [JA13252, JK2010044]
- Natural Science Foundation of Fujian Province [J01053]
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A series of environmentally benign bis-SO3H-functionalized Bronsted acidic ionic liquids were synthesized by using aliphatic polyamines and 1,3-propanesultone as the source chemicals. These ionic liquids acted as efficient inexpensive and recyclable catalysts for cyclotrimerization of aliphatic aldehydes at room temperature under solvent-free conditions. The reactions proceeded smoothly with good to excellent isolated yields (66.9-97.6 %=) and were generally complete in 1.5 h when the amount of ionic liquids was 0.1 mol%. The ionic liquids could be recovered readily and reused five times without any significant loss in their catalytic activity.
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