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ZnCl2 is generally considered a more suitable Lewis acid for synthesizing iminodisuccinic acid from ammonium bicarbonate and fumaric acid. This is because ZnCl2 is a weaker Lewis acid than AlCl3, which can promote undesirable side reactions. CuCl, on the other hand, is less effective in catalyzing the reaction. The choice of Lewis acid can significantly impact the yield and purity of the final product.