1. 新疆大学 a. 石油化工天然气精细化工教育部&自治区重点实验室; b. 化学化工学院，新疆 乌鲁木齐 830046
Synthesis of Xanthenes Catalyzed by Ionic Liquid 1-Ethyl-3-(4-sulfobutyl)-1H-imidazol-3-ium -p-Toluenesulfonate
TIAN Xiao-yue1a, ZHANG Yong-hong1a, SUN Ya-dong1a, WANG Duo-zhi1b, LIU Chen-jiang1a
a. The Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region; b. College of Chemistry and Chemical Engineering, 1. Xinjiang University, Urumqi 830046, China
Abstract：Brnsted acidic ionic liquid, 1-ethyl-3-(4-sulfobutyl)-1H-imidazol-3-ium -p-toluenesulfonate(IL1), was prepared using 1-ethylimidazole as raw material. A series of xanthenes were synthesized by condensation reaction of aromatic aldehydes with 5,5-dimethyl-1,3-cyclohexanedione or 1,3-cyclohexanedione catalyzed by IL1 under solvent-free conditions. The structures were characterized by 1H NMR, 13C NMR and ESI-MS. The results indicated that 5 mol% IL1 as catalyst, reaction at 80 ℃ for 40 min, the yields were 78%~95%. The catalytic activity of IL1 keep stable with the yields of 86%~89% after recycling of three times.
2016, Vol. 24 
