Fischer esterification mechanism
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Overview: The general form of Fischer esterification mechanism is as follows: 
The first step involves protonation of the carbonyl oxygen, followed by the nucleophillic attack of the alcohol.  Then a loss and regain of a proton,  followed by loss of water as electrons from the alcohol oxygen kick down to form the double bond. Loss of a proton yields the ester. Example of fischer esterification:    |
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