Reaction network of aldehyde hydrogenation over sulfided Ni?Mo/AlO catalysts
作者:X WANG、R SALEH、U OZKAN
DOI:10.1016/j.jcat.2004.12.010
日期:2005.4.1
A reactionnetwork of aldehyde hydrogenation over NiMoS/Al2O3 catalysts was studied with aldehydes with straight and branched carbon chains and different chain lengths as feed materials. The reactions in the gas phase and the liquid phase were compared. The main reaction in the aldehyde hydrogenation process is the hydrogenation of the CO double bond, which takes place over the coordinatively unsaturated
以碳链为直链和支链,链长不同的醛为原料,研究了NiMoS / Al 2 O 3催化剂上醛加氢反应网络。比较了气相和液相中的反应。醛加氢过程中的主要反应是CO双键的加氢,该加氢发生在配位不饱和位点上。主要的副反应是醛的自缩合和醛与醇的缩合。这两个反应都涉及α-氢,并且主要由暴露的Al 2 O 3表面上的酸碱双功能位点催化。
Acetonyltriphenylphosphonium bromide in organic synthesis: a useful catalyst in the cyclotrimerization of aldehydes
作者:Yung-Son Hon、Chia-Fu Lee
DOI:10.1016/s0040-4020(01)00588-9
日期:2001.7
Acetonyltriphenylphosphonium bromide (ATPB) is a useful catalyst for the cyclotrimerization of the aliphatic aldehydes under solvent-free condition. The aldehydes tethered with a variety of functionality such as olefin, ether, ester, bromide, azide and diester could also be cyclotrimerized under the catalysis of ATPB.
Montmorillonite clay-catalyzed cyclotrimerization and oxidation of aliphatic aldehydes
作者:Matthew R. Dintzner、Yawo A. Mondjinou、Dominic J. Pileggi
DOI:10.1016/j.tetlet.2009.12.009
日期:2010.2
A temperature-dependent equilibrium is observed for the cyclotrimerization of aliphaticaldehydes in the presence of Montmorillonite K10 clay, while aerobic oxidation of aliphaticaldehydes to the corresponding carboxylic acids is favored at room temperature in the presence of Montmorillonite KSF clay.
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
Allylstannation III. Synthesis of homoallylic alcohols and 4-chloro-2,6-dialkyl-3-methyltetrahydropyrans by reactions between (E/Z)-2-butenyldichloro-n-butyltin and aldehydes
(in various cis/trans isomer ratios) reacts readily with neat RCHO (R = CH3, C2H5, (CH3)2CH, and C6H5) at 25°C to give (a) linear alcohols, RCH(OH)CH2CHCHCH3 in the E and Z forms, (b) branched alcohols, RCH(OH)CH(CH3)CHCH2 in the threo and erythro forms, and (c) 2,3,4,6-tetra-substituted tetrahydropyrans (A) as a mixture of cis/trans isomers arising from the CH(CH3)CHCl bond. The maximum yields