Synthesis Phenobarbital

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the second approach utilizes diethyl carbonate in presence of strong base give α-phenylcyanoacetic ester. alkylation of ester using ethyl bromide proceeds via nitrile anion intermediate give α-phenyl-α-ethylcyanoacetic ester. product further converted 4-iminoderivative upon condensation urea. acidic hydrolysis of resulting product gives phenobarbital.









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