壳聚糖席夫碱钴催化环己烯烯丙位氧化反应的研究

摘要

制备了壳聚糖( CS)水杨醛席夫碱钴配合物，利用X射线粉末衍射( XRD)、红外( IR)等方法对其结构特征进行了分析，并以氧气为氧化剂，评价了该配合物的环己烯氧化催化性能，初步考察了催化剂用量、反应温度以及反应时间等因素对氧化反应的影响。实验结果表明：CS-席夫碱钴配合物具有良好的环己烯催化氧化活性和较高的烯丙位氧化选择性，在较优条件下，环己烯转化率和烯丙位氧化选择性分别达到85．3%和81．3%；催化剂具有较好的稳定性，易分离可多次重复使用。%A chitosan-schiff base cobalt comples( CS-Schiff base-Co) was prepared and characterized by X-ray diffraction,infrared spectroscopy and TG method,as well as the catalytic properties of this complex in oxidation of cyclohexene were studied in the pres-ence of oxygen. And the influences of the amount of catalyst,reaction temperature and reaction time on oxidation were also investiga-ted. These results indicated that CS-Schiff base-Co catalyst had excellent catalytic activity and selectivity for the allylic oxidation in cyclohexene. The conversion and selectivity were 85. 3%and 81. 3%under suitable conditons,respectively. The catalyst was perfect-ly leach-proof and could be resued at least four times.