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The synthesis of iminodisuccinic acid (IDS) from fumaric acid and ammonium bicarbonate is a complex reaction that involves several steps. The reaction temperature is not a single value, but rather a range. The initial reaction with fumaric acid and ammonium bicarbonate will likely be carried out around 100-120 °C to facilitate the formation of the succinamic acid intermediates. Further heating may be required to form the imine linkage between the two succinamic acid molecules, likely reaching temperatures around 150-180 °C. However, the exact conditions will depend on several factors such as the solvent, the concentration of reactants, and the presence of catalysts. It is recommended to consult a reliable organic chemistry textbook or research articles for more detailed information and specific reaction conditions.