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

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