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The reaction of fumaric acid with ammonium bicarbonate in water to form iminodisuccinic acid involves several steps and intermediates. Here's a simplified outline:
1. Ammonium bicarbonate decomposes to form ammonia (NH3), carbon dioxide (CO2), and water (H2O).
2. Ammonia acts as a nucleophile and attacks the double bond of fumaric acid. This results in the formation of a carbanion intermediate.
3. The carbanion intermediate reacts with another molecule of fumaric acid via an S N 2 reaction, leading to the formation of a dicarboxylic acid intermediate.
4. The dicarboxylic acid intermediate undergoes a cyclization reaction with the loss of water molecule to form iminodi succinic acid.
This process is a complex reaction that involves multiple steps and intermediates. The exact mechanism is not fully understood, but the steps mentioned above provide a general overview of the process.