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Bromine addition to trans-cinnamic acid

During bromine addition to trans-cinnamic acid, why is it necessary to maintain excess bromine in the reaction mixture and how can you tell there is an excess of bromine?

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You will want an excess of bromine to push the reaction forward to completion. Having your substrate ...

Solution Summary

It explains the reason why that excess bromine is required in the reaction with trans-cinnamic acid.