Xanthone was efficiently synthesized from o-chlorobenzoic acid first by etherization and then by Friedel-Crafts reaction in the presence of aluminium trichloride. 以邻氯苯甲酸为原料,先进行醚化,再在三氯化铝的作用下进行傅-克反应,可简洁、高效的合成呫吨酮。
Content Analyse of Etherization 3-chloro-2-hydroxypropyl Triethyl Ammonium Chloride 醚化剂3-氯-2-羟丙基三甲基氯化铵的含量分析
Conclusion The experimental results showed that the yield ( 98%) of etherization was 10% more than that reported in the literature. 整个反应革除了用柱色谱分离而直接得到产物。结论酚醚化反应收率为98%,比文献报道提高了10%以上。
Methods The three steps ( esterification, etherization and reduction) were changed for the first two steps ( reduction and selected etherization). 方法为避免选择性醚化反应,将前两步(还原和选择性醚化)反应,重新设计和调整为三步反应,即酯化、醚化和还原反应。
The Research on Resin Catalyst Ac-tiveness in Etherization Technology 醚化工艺技术中树脂催化剂活性的研究
Trimethylolpropane selected allyl etherization and polyester modified air-drying TMP选择烯丙醚化及PE气干型改性