Selective pyrolysis of bifunctional compounds: gas-phase elimination of carbonate–ester functionalities
作者:Talal F. Al-Azemi、Hicham H. Dib、Nouria A. Al-Awadi、Osman M.E. El-Dusouqui
DOI:10.1016/j.tet.2008.01.002
日期:2008.4
Compounds containing both carbonate and ester functionalities were synthesized and then subjected to online-GC gas-phasepyrolysis. The carbonate groups were cleaved selectively in all elimination reactions. The end products of the reaction were found to be affected by the nature of the substrate. The presence of hydrogen and carbonyl substituents on the carbon β to the carbonate group resulted in
Retention Indices and Enthalpies of Sorption of Esters of Neopentyl Glycol on DB-1 Stationary Phase
作者:O. D. Lukina、E. L. Krasnykh、S. V. Portnova、S. V. Levanova
DOI:10.1134/s0036024420030188
日期:2020.3
The logarithmic retention indices and the enthalpies of sorption at the average temperature of an experiment and 298.2 K are determined via gas-liquid chromatography using DB-1 stationary phase for esters of neopentyl glycol and C-2-C-6 monobasic carboxylic acids of linear and branched structure at 423.2-523.2 K. The temperature dependences of the studied compounds' retention indices are obtained, and the linearity of these dependences in the investigated range of temperatures is demonstrated. The values obtained for the enthalpies of sorption are analyzed.
Selective Mixed Tishchenko Reaction via Substituted 1,3-Dioxan-4-ols
作者:Olli P. Törmäkangas、Pauli Saarenketo、Ari M. P. Koskinen
DOI:10.1021/op0100652
日期:2002.3.1
Monoesters of 1,3-diols can be prepared with the mixed Tishchenkoreaction from β-hydroxy aldehydes and another aldehyde. These two aldehydes form a diastereomeric mixture of 1,3-dioxan-4-ol hemiacetal derivatives which can be further converted to monoesters with suitable catalysts. Limitations in the formation and esterification of this hemiacetalintermediate have been investigated in this work and the formation