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[Chemical Knowledge]：Precautions and Steps for Preparation of Benzoanilide

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Benzanilide is an important organic synthesis intermediate, which is commonly used in the preparation of dyes, drugs and fungicides. Synthesis of benzanilide need to pay attention to some key matters, the following will introduce the preparation of benzanilide notes and steps. Precautions for

:
1. Raw material selection
The raw materials for the preparation of benzanilide are mainly benzoic acid, aniline and dehydrating agent, of which the purity of benzoic acid and aniline is required to be higher, generally above 99%.
2. Reaction Conditions The reaction conditions for the
preparation of benzanilide are mainly carried out in an organic solvent, usually benzene or toluene is selected as the solvent. The reaction process needs to be carried out at a higher temperature and a certain pressure, and safety protection should be paid attention.
3. catalyst selection
reaction need to select the appropriate catalyst to promote the reaction, commonly used catalyst is sulfuric acid, ferric chloride, etc. The choice of catalyst needs to be determined according to the specific reaction conditions.
4. The reaction monitoring
needs to monitor the reaction in real time during the reaction process to ensure that the reaction temperature, pressure and the amount of raw materials are within the appropriate range.

preparation steps:
1. put benzoic acid and aniline into a reaction kettle according to a certain molar ratio, and add an appropriate amount of dehydrating agent as a desiccant.
2. The heating reaction is started and the reaction is carried out at a suitable temperature and pressure. During the reaction, it is necessary to stir the reaction solution periodically and control the reaction temperature.
3. After the reaction is completed, the mixture is cooled to room temperature and extracted with an appropriate extractant to obtain the target product.
4. The product is subjected to post-treatment steps such as crystallization, washing and drying to obtain a high-purity benzoanilide product.

above is the preparation of benzanilide need to pay attention to matters and synthetic steps in detail, we hope to help.