Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Patent
1986-12-11
1988-07-26
Evans, J. E.
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
570202, C07C 1734, C07C 1700, C07C 1724
Patent
active
047602090
ABSTRACT:
In the preparation of 3,5-dichloro-.alpha.-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.
REFERENCES:
patent: 2920109 (1960-01-01), Angelkorte
patent: 3553274 (1971-01-01), Lewis et al.
patent: 4059642 (1977-11-01), Dewald et al.
patent: 4087473 (1978-05-01), Markley
patent: 4347390 (1982-08-01), Nishiyama et al.
patent: 4348265 (1982-09-01), Strom
patent: 4686311 (1987-08-01), Jackisch
Bachman et al, J. Am. Chem. Soc., 70 (1948) pp. 1772-1774.
Cubbon et al, The Properties of Nuclear Brominated Styrenes I, pp. 479-483.
Beitzke Bernhard
Blank Heinz U.
Henneke Karl-Wilhelm
Herzhoff Michael
Neuner Otto
Bayer Aktiengesellschaft
Evans J. E.
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