酯化

苯甲酸 → 苯甲酸乙酯:查看反应物、产物、反应条件与来源依据,探索相关转化和合成路径。

试剂
乙醇;H2SO4 催化剂
条件
与酸催化剂一起温热;所链接的微型实验采用水浴
反应类别
酯化
方程式
C6H5COOH + CH3CH2OH <=> C6H5COOCH2CH3 + H2O

概览

酸活化使乙醇可加成到苯甲酸上;经质子转移和脱水,形成苯甲酸乙酯。整个酰基取代过程中,芳环保持完整。

转化

苯甲酸 → 苯甲酸乙酯

方程式
C6H5COOH + CH3CH2OH <=> C6H5COOCH2CH3 + H2O
反应物
Benzoic acid + Ethanol
产物
Ethyl benzoate + Water
试剂
乙醇;H2SO4 催化剂
反应环境
与酸催化剂一起温热;所链接的微型实验采用水浴
反应类别
酯化
机理
acid-catalysed nucleophilic acyl substitution
Evidence level
source-backed molecular example

参考步骤

Microscale ethyl-benzoate formation

Benzoic acid + ethanol ⇌ ethyl benzoate + water

物料与用量

  • 苯甲酸
  • 乙醇
  • Sulfuric-acid catalyst as specified in the source

仪器装置

  • Reference microscale pipette apparatus
  • Controlled water bath

实验步骤

  1. Use the source’s benzoic-acid/ethanol mixture and catalyst in its prescribed microscale apparatus.
  2. Warm in the controlled water bath and cool before assessment.

后处理与分离

  1. This reference demonstrates ester formation without an isolation sequence or a validated percentage yield.
  2. For product identification, obtain chromatographic or spectroscopic evidence from a separately validated isolation method.

关键控制条件

  • The starting acyl compound is benzoic acid, not benzoyl chloride.
  • Identify the product using its analytical measurements.
  • Do not generalise the source’s small apparatus to a larger scale or an improvised sealed vessel.

实验技术

控温加热

应按来源给出的温度控温,选用适合溶剂、用量和目标温度的热源及容器。“加热”本身并不构成完整操作步骤。

装置设置

  1. 根据来源给出的温度选择浴液:水浴温度上限接近 100 °C;更高温度需使用合适的油浴、沙浴或指定加热装置。
  2. 固定好容器,合理放置温度探头,使其稳定测量反应体系或浴液温度,并避免接触加热器。
  3. 除非来源方法明确要求额定耐压设备,否则应保持装置可排气;不得将普通玻璃仪器临时改成密闭反应器。
  4. 逐步将混合物升至规定温度,达到工作温度后再开始计时。

操作检查

  • 易燃有机溶剂应使用电加热,避免明火。
  • 防暴沸颗粒应在加热前加入,不得加入热液体中。
  • 若来源仅写“加热”,不得自行推定温度、时间或用量;应先取得针对具体底物的操作方法。

底物范围

适用范围
Benzoic acid supplies the aromatic acyl group; ethanol supplies the ethoxy group.
来源说明
This direct acid/alcohol equilibrium differs from benzoyl-chloride alcoholysis. Isolation and purity belong to the linked practical record.

相关反应

参考文献

  1. Microscale preparation of ethyl benzoateRoyal Society of Chemistry · RSC Education

    Verified 2026-09-16 alongside the practical catalog. Supports benzoic acid and ethanol esterification; this is a different starting material from benzoyl chloride.

  2. Pearson Edexcel International Advanced Level Chemistry Student Practical GuidePearson Education Limited · Pearson qualifications · 2018

    Supports the practical distinctions between reflux, distillation, liquid-liquid separation, washing and drying in organic preparations.