丙二酸二乙酯合成机理

丙二酸二乙酯合成机理
英文回答：
Mechanism of Diethyl Succinate Synthesis.
Diethyl succinate is an organic compound with the formula (CH3CH2OCOCH2CH2COOCH2CH3). It is a colorless liquid with a characteristic odor. Diethyl succinate is used as a flavoring agent, a fragrance ingredient, and a plasticizer.
Diethyl succinate is synthesized by the reaction of succinic anhydride and ethanol. The reaction is catalyzed by a base, such as pyridine. The mechanism of the reaction is as follows:
1. The base protonates the succinic anhydride, forming
a succinic acid anion.
2. The succinic acid anion reacts with the ethanol,
forming an ester bond.
3. The pyridine is regenerated, and the diethyl succinate is formed.
The overall reaction is as follows:
(CH2CO)2O + 2 CH3CH2OH → (CH3CH2OCOCH2CH2COOCH2CH3) + H2O.
中文回答：
丙二酸二乙酯合成机理。

丙二酸二乙酯是一种有机化合物，化学式为
(CH3CH2OCOCH2CH2COOCH2CH3)。

它是一种无色液体，具有特征性气味。

丙二酸二乙酯用作香料剂、香精成分和增塑剂。

丙二酸二乙酯是通过琥珀酸酐和乙醇反应合成的。

该反应由碱（如吡啶）催化。

反应机理如下：
1. 碱质子化琥珀酸酐，形成琥珀酸根阴离子。

2. 琥珀酸根阴离子与乙醇反应，形成酯键。

3. 吡啶再生，丙二酸二乙酯形成。

总反应如下：
(CH2CO)2O + 2 CH3CH2OH → (CH3CH2OCOCH2CH2COOCH2CH3) + H2O.。