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Reaction of cinnamic acid with Br2/Na2CO3

The first reaction produces benzaldehyde, and the next one (perkin’s condensation)produces Cinnamic acid.(X) Now the treatment of X with $\ce{Br2/Na2CO3}$ is whats troubling me. $\ce{Na2CO3}$ being a base, abstracts the hydrogen from the $\ce{COOH}$ group. $\ce{Br2}$ reacts with the alkene portion to yield a cyclic intermediate. What next? The solution claims that somehow The $\ce{CO2-}$ […]