专业英语的实验报告
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Organic chemistry experiment report
实验名称:肉桂酸的制备
学院:化学科学与技术学院
专业:化学
班级:11化学2班
姓名:钱满才
学号:2011364207
指导教师:刘生桂
日期:2013年10月31日
The preparation of cinnamic acid Introduction:
Cinnamic acid C9H8O2 (also called cinnamic acid),Monoclinic crystal, melting point is 135 ~ 136 ℃, boiling point is 300 ℃.It has two kinds of cis-trans-isomer.It exists in tolu balsam, Sue balsam, etc.Cinnamic acid is the production of coronary heart disease drugs, one of the important intermediates.Its esters derivatives is an important raw material of the preparation of essence and food spices.It also has been widely used in agricultural plastics and photosensitive resin,.This experiment using the Perkin reaction, after mixing aromatic aldehyde and a carboxylic acid anhydride, heating in the presence of the corresponding carboxylic acid salt, aldol condensation reaction, after dehydration ,generate target product cinnamic acid. This experiment using potassium carbonate instead of sodium acetate, can shorten the reaction time.
One.Experimental Objective
First.Understand the principle and method of
preparation of cinnamic acid;
Second.To master the principle ,usage and
operations of water vapor distillation;Third.Learn and master the purification method of solid organic compounds: decoloring and
recrystallization.
Two.Experiment Principle
ing benzene, formaldehyde and acetic anhydride as raw materials,make it happen
Perkin reaction..The following is Chemical
reaction equations:
Second.The reaction mechanism is that the acetic acid anhydride removing a H under the effect of
weak base , than form CH3COOCOCH2-,the
process as following:
Three.The main reagent and physical properties
First.the main reagents:anhydrous potassium carbonate、benzaldehyde、acetic acid anhydride、
sodium hydroxide solution、1:1 hydrochloric acid、
activated carbon 、Cinnamic acid
Second .the physical properties
the physical properties of main reagents
name
molecular weight melting point /℃ boiling point /℃ Appearance and properties benzaldehyde 106.12
-26
179
The pure substance is colorless liquid,but industrial products are colorless to pale yellow liquid with the bitter almond smell acetic acid anhydride 102.09 -73.1 138.6
It is colorless transparent liquid with a stimulating smell. Cinnamic acid 148.17
133
300
It is white to light yellow
powder with micro cinnamon aroma
Four. The dosage of Reagent
Five. The apparatus and diveces
First. The apparatus: 150ml three-necked flask
、500ml beaker 、glass bar 、measuring cylinder 、300℃thermometer 、straight condenser pipe 、induction cooker 、economical allihn condenser 、watch-glass 、 filter paper 、Buchner funnel 、filter flask 、conical flask
Second. The diveces:
Reagent
benzaldehyde
acetic acid anhydride
anhydrous potassium carbonate
10%sodium hydroxide solution
hydrochloric
acid
Theoretical dosage
5.0ml 14.0ml 7.00g 40.0ml 40.0ml