Synthetic Route of C4H6O4. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about Functionalized quaternary ammonium salt ionic liquids (FQAILs) as an economic and efficient catalyst for synthesis of glycerol carbonate from glycerol and dimethyl carbonate. Author is Elhaj, Elrasheed; Wang, Huajun; Gu, Yanlong.
A series of functionalized quaternary ammonium salt ionic liquids (FQAILs) with different functional groups, such as hydroxyl, carboxyl, ether group, and amino, were prepared and used as a catalyst for the synthesis of glycerol carbonate from transesterification of glycerol and di-Me carbonate without any addnl. organic solvent and co-catalyst. The effects of functional groups, anions (Cl-, Br-, I-, OH-), and reaction parameters were investigated in detail. It is found that both the cation and anion of FQAILs display an important effect on its catalytic activity. Among these FQAILs, hydroxyl functionalized ionic liquid, [HPTPA]OH possesses the highest activity because there are the strong interactions between hydroxyl and di-Me carbonate mol. and between anion OH- and glycerol mol., which were shown by FTIR spectra. The glycerol conversion of 96.2% and glycerol carbonate yield of 87.6% can be obtained over [HPTPA]OH under moderate conditions of reaction temperature of 80 °C, reaction time of 90 min, di-Me carbonate/glycerol molar ratio of 3, and catalyst amount of 0.9 mol% based on glycerol amount The [HPTPA]OH catalyst can be reused at least three cycles without significant reduction in its catalytic activity. Finally, a possible reaction mechanism for the synthesis of glycerol carbonate is also proposed.
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