2-乙基苯并噁唑的微波超声波辅助合成  

Synthesis of 2-Ethylbenzoxazole Assisted with Microwave and Ultrasonic Wave

作　　者：刘智军[1] 张平[1] 王石[1] 谢建春[1] 孙宝国[1] 

机构地区：[1]北京工商大学食品添加剂与配料北京高校工程研究中心/北京市食品风味化学重点实验室,北京100048

出　　处：《北京工商大学学报（自然科学版）》2012年第6期40-44,共5页Journal of Beijing Technology and Business University:Natural Science Edition

基　　金：北京工商大学本科生科研学术创新基金项目;北京工商大学研究生科研学术创新基金项目;北京市教委科技发展计划重点项目(KZ201010011011)

摘　　要：以2-氨基苯酚、丙酸为原料,多聚磷酸为催化剂,微波超声波辅助合成了2-乙基苯并噁唑.通过考察原料与催化剂摩尔配比,反应温度,反应时间等因素的影响,得出较佳工艺条件为:微波和超声波功率分别为800 W,2-氨基苯酚与丙酸的摩尔配比为1:5.5,催化剂多聚磷酸与2-氨基苯酚的摩尔配比为0.52:1,130℃,反应时间15 min.反应液经萃取、减压蒸馏处理,得含量为99.78%的产物,产率47.96%,产物结构通过质谱、红外光谱和核磁共振进行了确认.产物具有浓郁的青香、咸香、清甜、凉香气特征,与2-甲基苯并噁唑相比,香气差别较大.2-Ethylbenzoxazole was synthesized and polyphosphoric acid （PPA）as the catalyst using assist 2-aminophenol and propionic acid as the reagents ed with microwave and ultrasonic wave. The influ- ences of mole ratio of catalyst to reactant, reaction temperature, and reaction time were investigated. The optimum technology found was microwave power 800 W, ultrasonic wave power 800 W, the mole ratio of propionic acid to 2-aminophenol in 5.5： 1, the mole ratio of PPA to 2-aminophenol in 0.52： 1, reaction temperature 130 ℃ , and reaction time 15 min. After extracted and distilled in vacuum, the concentration of product of 2-ethylbenzoxazole reached to 99.78% with the yield of 47.96 %. Compared to 2-methyl- benzoxazole, organoleptic characteristics of 2-ethylbenzoxazole was significantly different, which smelled green, salty, sweet, and cool. The structure of 2-ethylbenzoxazole was confirmed by IR, MS and 1H-NMR.

关 键 词：2-乙基苯并噁唑 2-氨基苯酚 微波 超声波 香料 合成 

分 类 号：TS202.3[轻工技术与工程—食品科学]