钨酸均相催化法合成戊二醛

介绍用过氧化氢水溶液一步催化氧化环戊烯合成戊二醛的工艺路线 ,讨论了催化剂、助催化剂、溶剂等因素对戊二醛收率的影响 .在钨酸与三氧化二硼的质量比为 1 1 ,反应温度为 3 5℃ ,反应时间为 4h ,以叔丁醇为溶剂的优化工艺下 ,可得到最高戊二醛收率为 71 .2 % .     

The effect of co-catalysts on the morphology of isotactic polypropene prepared using metallocene catalyst

SiO₂/rac-Me₂Si[2-Me-4-Naph-Ind]₂ZrCl₂ was prepared and different co-catalysts were used in bulk polymerization of propene. The morphology of polypropene could be controlled by altering the co-catalysts. The isotactic polypropene with good morphology and high bulk density were prepared. The formation mechanism of active centers was proposed, by which the effect of co-catalysts on the morphology of polypeopene was analyzed.     

对苯二甲酸双羟丁酯直接酯化工艺研究

讨论了酯化温度、催化剂种类、用量及投料方式对酯化速度和THF生成量的影响.研究表明:采用钛锡复合催化剂能有效地提高酯化反应速度,减少THF生成;PTA逐步加入可将THF生成降到5.2?.     

含有亲水取代基的手性salen-manganese(Ⅲ)配合物的合成与催化

合成了两个新型的手性salen-manganese(Ⅲ)配合物,在分别以吡啶氮氧化物和醋酸铵为助催化剂的条件下,运用于催化茚的不对称环氧化反应.以次氯酸钠为氧化剂,在水和二氯甲烷双相的反应体系中,得到了中等到良好的对映选择性以及可以接受的反应产率.由于在salen-manganese(Ⅲ)基体结构的5,5'位引入了亚甲胺基,因此,这两个环氧化催化剂可能具有某种相转移能力.