A convenient approach for the synthesis of 1,3,5-trioxanes under solvent-free conditions at room temperature
作者:Xinzhong Li、Qi Lin、Rong Cao
DOI:10.1007/s00706-014-1150-8
日期:2014.6
environmentally benign bis-SO3H-functionalized Brønsted 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
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
Synthesis of 1,3,5-trioxanes: A new, simple method using a bentonitic earth as catalyst.
作者:R. Camarena、A.C. Cano、F. Delgado、N. Zúñiga、C. Alvarez、O. García
DOI:10.1016/s0040-4039(00)91813-6
日期:1993.10
A simple method for synthesizing aliphatic as well as aromatic 1,3,5-trioxanes using as catalyst a bentonitic earth is reported. The yields ranged from good to excellent.
Determination of ceiling temperature and thermodynamic properties of low ceiling temperature polyaldehydes
作者:Jared M. Schwartz、Anthony Engler、Oluwadamilola Phillips、Jihyun Lee、Paul A. Kohl
DOI:10.1002/pola.28888
日期:2018.1.15
Knowledge of the ceiling temperature and thermodynamic variables for low ceiling temperature polymers is critical to understanding the material's synthesis and use. Synthesis of the polymer below its ceiling temperature is the routine polymerization route. In situ 1H NMR of the equilibrium polymerization reaction can provide critical information for determining the enthalpy and entropy of polymer formation
Das vorliegende Verfahren ermöglicht die Stabilisierung von aliphatischen C3-C14-Aldehyden gegen Polymersiation und Autokondensation. Es umfaßt den Zusatz von alkalisch reagierenden Substanzen zu den Aldehyden, wobei als alkalisch reagierende Substanz Alkalimetallhydroxide, Erdalkalimetallhydroxide, Alkalimetallcarbonate, Erdalkalimetallcarbonate oder Erdalkalimetallcarboxylate verwendet werden und dem zu stabilisierenden Aldehyd in Mengen von 0.05 - 20 ppm, bezogen auf den Aldehyd, zugesetzt werden.