用聚乙烯呲咯烷酮-钯络合物作为催化剂的硝基化合物的加氢

制备了以二氧化硅为载体的聚乙烯吡咯烷酮-钯络合物,可在常温常压下催化芳香族硝基化合物的加氢还原反应。其催化活性高于文献值。对硝基苯及间二硝基苯的加氢反应收率可达100％。该体系加入适量乙酸,可显著提高其催化活性,回收使用几乎不降低催化活性,本文还研究了络合物中氮钯克原子比、溶剂及芳香族硝基化合物取代基的种类和位置对加氢速度的影响。

HYDROGENATION OF NITRO-COMPOUNDS CATALYZED BY SILICA-POLYVINYLPYRROLIDONE-Pd COMPLEX

Silica-supported polyvinylpyrrolidone-Pd complex has been prepared and has shown that it can be used as an active catalyst for the hydrogenation of aromatic nitro-compounds at room temperature and atmospheric pressure. The stability of this catalyst during hydrogenation may be increased by adding equimolar acetic acid. The effects of N/Pd molar ratio in the comples, solvents and the kind of substrates used on the catalytic activity were also studied.