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Disodium fumarate is a salt, not an electrophile suitable for a Michael addition. Michael additions involve nucleophilic attack on an α,β-unsaturated carbonyl compound. Ammonium bicarbonate is a base, which could potentially deprotonate the disodium fumarate, but wouldn't directly participate in the Michael addition. It's important to have an appropriate Michael acceptor (electrophile) for this reaction to proceed.