Alkylation of Methyl Linoleate with Propene in Ionic Liquids in the Presence of Metal Salts
作者:Christian Pomelli、Tiziana Ghilardi、Cinzia Chiappe、Alberto de Angelis、Vincenzo Calemma
DOI:10.3390/molecules201219805
日期:——
Vegetable oils and fatty acid esters are suitable precursor molecules for the production of a variety of bio-based products and materials, such as paints and coatings, plastics, soaps, lubricants, cosmetics, pharmaceuticals, printing inks, surfactants, and biofuels. Here, we report the possibility of using Lewis acidic ionic liquids (ILs) to obtain polyunsaturated ester dimerization-oligomerization and/or, in the presence of another terminal alkene (propene), co-polymerization. In particular, we have tested the Lewis acidic mixtures arising from the addition of a proper amount of GaCl3 (Χ > 0.5) to two chloride-based (1-butyl-3-methylimidazolium chloride, [bmim]Cl, and 1-butylisoquinolium chloride, [BuIsoq]Cl) or by dissolution of a smaller amount of Al(Tf2N)3 (Χ = 0.1) in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [bmim][Tf2N]. On the basis of product distribution studies, [bmim][Tf2N]/Al(Tf2N)3 appears the most suitable medium in which methyl linoleate alkylation with propene can compete with methyl linoleate or propene oligomerization.
植物油和脂肪酸酯是生产各种生物基产品和材料的合适前体分子,例如油漆和涂料、塑料、肥皂、润滑剂、化妆品、药品、印刷油墨、表面活性剂和生物燃料。在此,我们报告了使用路易斯酸离子液体(IL)进行多不饱和酯二聚-低聚反应的可能性,以及在存在另一种端烯烃(丙烯)的情况下进行共聚反应的可能性。具体而言,我们测试了通过向两种氯化物(1-丁基-3-甲基咪唑氯化物[bmim]Cl和1-丁基异喹啉氯化物[BuIsoq]Cl)中添加适量GaCl3(Χ>0.5)或通过在1-丁基-3-甲基咪唑双(三氟甲基磺酰)亚胺[bmim][Tf2N]中溶解少量Al(Tf2N)3(Χ=0.1)而产生的路易斯酸混合物。根据产品分布研究,[bmim][Tf2N]/Al(Tf2N)3似乎是甲基亚油酸与丙烯烷基化反应与甲基亚油酸或丙烯低聚反应竞争的最合适介质。