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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 42, 2012 - Issue 2
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Original Articles

Novel Acidic Ionic Liquids as Efficient and Recyclable Catalysts for the Cyclotrimerization of Aldehydes

, , &
Pages 266-273 | Received 21 Jun 2010, Published online: 14 Sep 2011
 

Abstract

A mild, efficient, and ecofriendly procedure for cyclotrimerization of aldehydes was realized by using a series of novel Brønsted acidic ionic liquids (BAILs) consisting of double–SO3H groups in cations as catalysts. Good conversion of aldehydes and selectivity of trialkyl-1,3,5-trioxanes were achieved by using 1 mol% of BAILs. In addition, the catalyst system could be recycled and reused at least eight times without apparent loss of activity.

GRAPHICAL ABSTRACT

Notes

a IL/isobutylaldehyde = 0.5% (molar ratio).

a Aldehyde (30 mmol), [Bis-BsPy][CF3SO3]2/aldehyde = 1% (molar ratio), reaction temperature 25 °C, reaction time 60 min.

b [Bis-BsPy][CF3SO3]2/aldehyde = 2% (molar ratio).

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