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Multiple Choice
Beginning from benzene, provide the chemical steps needed to prepare phenylalanine via HVZ method.
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Start with benzene and perform a Friedel-Crafts alkylation using CH₃Br and AlBr₃ to introduce a methyl group, forming toluene.
Brominate the methyl group using Br₂ and light (hv) to form benzyl bromide.
React benzyl bromide with magnesium in ether to form a Grignard reagent, phenylmagnesium bromide.
React the Grignard reagent with an epoxide to extend the carbon chain, forming a primary alcohol after hydrolysis with H₃O⁺.
Oxidize the primary alcohol to a carboxylic acid using KMnO₄ and H₂O, then perform the Hell-Volhard-Zelinsky (HVZ) reaction with Br₂ and PBr₃ to introduce a bromine atom at the alpha position, followed by substitution with NH₃ to form phenylalanine.