preparation of p-methybenzoic acid from benzen
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Step 1. Friedel-Crafts halogenation
React the toluene with bromine in the presence of aluminium bromide.
Friedel-Crafts halogenation
Friedel-Crafts halogenation
Step 2. Carboxylation of a Grignard reagent
Form a Grignard reagent by the reaction with magnesium in dry ether, then add carbon dioxide.
Carboxylation
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