基于绿色化学理念的苯甲醛与安息香的相互转化

doi:10.3866/PKU.DXHX201911006

Abstract

Abstract:

In order to bring the concept of green chemistry into basic laboratory teaching and to enhance the exercise on redox reactions, we designed an experiment about the mutual conversion between benzoin and benzaldehyde. In this experiment, benzaldehyde is catalyzed by Vitamin B₁ to be converted to benzoin, then benzoin is reduced with sodium borohydride into 1, 2-diphenyl glycol. Afterwards, the product will be oxidated into benzaldehyde under the catalyzing of new green catalyst NaMnO_x. ¹H NMR was used to authenticate the product in each step of the experiment, and the yield of the oxidation reaction is greater than 90% with HLPC measurement. By completing this cyclic conversion reaction, we conveys the idea of green chemistry to the students, and the students get practice on operating the redox reaction. At the same time, students' cognition and evaluation of chemical reaction can be more complete.

Key words: Green chemistry, Benzoin, Benzaldehyde, Redox reaction, Mutual conversion

MSC2000:

Du Xin, Wang Tianze, Chen Duwen, Yu Jingcheng, Sha Guangyan. Mutual Conversion between Benzaldehyde and Benzoin Based on the Idea of Green Chemistry[J].University Chemistry, 2020, 35(4): 19-26.

Figures/Tables 11

References 10

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名称	型号	生产厂家
电热恒温鼓风干燥箱	DHGT-9053A	上海精宏实验设备有限公司
暗箱式紫外分析仪	ZF-20D	豫华仪器有限公司
循环水式真空泵	SHZ-D(Ⅲ)	巩义市豫华仪器有限公司
电子天平	DZF-6020	上海一恒仪器有限公司
旋转蒸发仪	RE-2000A	巩义市予华仪器有限公司
旋片式真空泵	2XZ-4	临海市谭氏真空设备有限公司
集热式恒温加热磁力搅拌	DF101S	巩义市豫华仪器有限公司

催化剂	反应物	反应物的摩尔质量/(mol?g^?1)	AE/%
NaMnO_x催化剂	二苯乙二醇+ 1/2O₂	230.26	92.17
Malaprade氧化	二苯乙二醇+ NaIO₄	428.15	49.57
Criegee反应	二苯乙二醇+ Pb(OAc)₄	657.64	32.27

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Mutual Conversion between Benzaldehyde and Benzoin Based on the Idea of Green Chemistry

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