3,4-Difluorotoluene3,4-二氟甲苯
3)3,4-dimethylbenzaldehyde3,4-二甲基苯甲醛
1.Studies on the Reaction Mechanism of CO-carbonylating Synthesis of 3,4-dimethylbenzaldehyde;CO羰基化合成3,4-二甲基苯甲醛的反应机理研究
2.The synthetic route and reaction mechanism of 3,4-dimethylbenzaldehyde were also introduced.叙述了3,4-二甲基苯甲醛国内外合成技术状况及各合成路线的对比,介绍了以邻二甲苯、CO、HCl为原料,以1,2-二氯乙烷为溶剂,Lewis酸为催化剂进行甲酰化反应的比较理想的合成方法和工艺流程,取物料配比为m(邻二甲苯)∶m(AlCl3)∶m(Cu2Cl2)∶m(二氯乙烷)=1∶1。
3.5 MPa,the formylation reaction for 6 h below-5℃,the carbonylation reaction for 50 min at-5~0℃,3,4-dimethylbenzaldehyde with a high purity above 98.0%的3,4-二甲基苯甲醛。
4)3,4-dihydroxy benzaldehyde3,4-二羟基苯甲醛
1.Synthesis of 3,4-dihydroxybenzaldehyde by air-catalytic oxidation;空气催化氧化合成3,4-二羟基苯甲醛
2.Methods Starting from 3,4-dihydroxybenzaldehyde,dl-tanshinol was synthesized by benzyl protection,Dazens reaction,Lewis acid selective ring opening,NaBH4 reduction,hydrolysis and hydrogenation.方法以3,4-二羟基苯甲醛为起始原料,经过苄基保护、Darzens反应、Lewis酸选择性开环、NaBH4还原、水解、氢化6步反应得到丹参素。
5)3,4-dihydroxybenzaldehyde3,4二羟基苯甲醛
6)3,4-Dichlorobenzaldehyde3,4-二氯苯甲醛
延伸阅读
3,4-二氟苯甲醛分子式：C7H4F2O分子量：142.11CAS号：34036-07-2性质：该品为无色至黄色液体。沸点53℃-55℃（15mmHg），闪点65℃，折光率1.5000，比重1.288。制备方法：暂无用途：医药、农药、液晶材料中间体。
