Novel Acidic Ionic Liquids as Efficient and Recyclable Catalysts for the Cyclotrimerization of Aldehydes
作者:Heyuan Song、Jing Chen、Chungu Xia、Zhen Li
DOI:10.1080/00397911.2010.523804
日期:2012.1.15
Abstract A mild, efficient, and ecofriendly procedure for cyclotrimerization of aldehydes was realized by using a series of novel Brønsted acidicionicliquids (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
compounds proved to be stable against air and moisture and therefore can be handled very easily. All compounds efficiently catalyze the oxidative coupling of hydrosil(ox)anes with aldehydes and ketones as oxidation reagents and simultaneously the reductive ether coupling at very low amounts of <0.01 mol %. Because the catalysts also catalyze the reversible cyclotrimerization of aldehydes, paraldehyde can
Process for the manufacture of cyclic acetals of aliphatic aldehydes
申请人:Chemische Werke Huels, A.G.
公开号:US04330474A1
公开(公告)日:1982-05-18
A process for preparing a cyclic acetal from a saturated, aliphatic aldehyde comprises contacting a saturated, aliphatic aldehyde of 2-16 carbon atoms with a silica gel.