- Process for preparing 3,5-dichloro-α-methylstyrene
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In the preparation of 3,5-dichloro-α-methylstyrene by isopropylation of an m/p-dichlorobenzene mixture, isomerization of the resulting alkylation mixture, subsequent side chain bromination of the alkylation mixture and dehydrobromination of the resulting bromination mixture, the improvement which comprises reacting an excess of an m/p-dichlorobenzene mixture which contains at least 50% by weight of m-dichlorobenzene with isopropyl halide, isomerizing the resulting alkylation mixture under pressure in the presence of aluminum chloride until thermodynamic equilibrium has been attained, separating off the isomerized alkylation mixture from the unreacted m/p-dichlorobenzene mixture, and recycling the unreacted mixture for further reaction.
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- Preparation of 3,5-dichloro-α-methylstyrene
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3,5-Dichloro-α-methylstyrene is prepared from α-bromo-3,5-dichlorocumene by reaction with alkali metal hydroxide solutions in the presence of phase-transfer catalysts.
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