几种金属盐催化剂对苯甲醛肟重排生成苯甲酰胺的催化作用

摘要

The catalytic performance of 4 kinds of metal salts SnCl2, CdCl2, Cr(CH3COO)3, and Cr(NO3)3 for the rearrangement of benzaldoxime yielding benzamide was studied. The effects of catalyst dosage as well as the reaction temperature and time on the yield were investigated while SnCl2 was used as a model catalyst. Results show that SnCl2 has the highest catalytic efficiency for the rearrangement from benzaldoxime to benzamide. The optimized reaction condition was suggested as SnCl2 to benzaldoxime molar ratio of 2 : 5, reaction temperature of 110 ℃ , and reaction time of 19 h. Under the optimized reaction condition, the yield of benzamide can reach 57. 6%.%考察了SnCl2,CdCl2,Cr(CH3COO)3,Cr(NO3)3四种金属盐对苯甲醛肟重排生成苯甲酰胺反应的催化作用；以SnCl2作为模型催化剂,探讨了催化剂用量、反应温度及反应时间等因素对产率的影响,确定了最佳反应条件.结果表明,SnCl2对苯甲醛肟重排生成苯甲酰胺反应的催化效率最高；最佳反应条件为:n(SnCl2)∶n(苯甲醛肟)=2∶5,反应温度110℃,反应时间19h,相应的苯甲酰胺产率达57.6％.