溴化甲基咪唑键联壳聚糖的制备及其催化N-羟烷基化研究

Preparation and N-Hydroxyl Alkylation Catalytic Performance of Methyl Imidazole Bromide Bonded on Chitosan

在水介质中,3-溴烷基-1-甲基咪唑溴化物与壳聚糖发生反应生成了离子液体键联壳聚糖(IL-b-CS)衍生物.通过红外光谱、核磁共振、X射线衍射和热重等分析技术对离子液体键联壳聚糖衍生物进行了结构表征.以离子液体键联壳聚糖衍生物为催化剂,研究了在无溶剂条件下其对芳香胺和碳酸乙烯酯N-羟烷基化反应的催化性能,讨论了反应条件(催化剂用量、反应物料比、反应温度和反应时间)对其催化性能的影响.

Ionic liquid bonded on chitosan derivative （IL-b-CS） was synthesized by the reaction of 3-bromoalkyl-l-methyl imidazolium bromide with chitosan in the environmentally friendly water medium. The characterization of IL-b-CS was carfled out by Fourier transform infrared spectroscopy （FT-IR）, the nuclear magnetic resonance （NMR）, X-ray diffraction （XRD） and the thermo gravimetric （TG）, respectively. Using IL-b-CS as catalyst, the catalytic performance on the N-hydroxyl alkyla- tion reaction of aromatic amine and ethylene carbonate under the solvent-free conditions was studied. Effect of the reaction conditions （for example： catalyst dosage, reaction material ratio, reaction temperature and reaction time etc.） on its catalytic activity was investigated in details.