Method for producing p-dichlorobenzene

Details Method for producing p-dichlorobenzene Method for producing p-dichlorobenzene

2007-05-01

2007-05-01

Parsa, J. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

Reexamination Certificate

active

10526557

ABSTRACT:
In a process for preparing p-dichlorobenzene by nuclear chlorination of benzene and/or chlorobenzene as the starting material with chlorine molecules, chlorination is carried out using aluminum chloride in an amount of 0.1–3 millimols per mol of the starting material and phenothiazines such as 10H-phenothiazine-10-carboxylic acid phenyl ester in an amount of 0.1–0.9 mols per mol of aluminum chloride so as to be a chlorination degree in a range of 1.2–2.5, by which p-dichlorobenzene can be obtained in a high para-selectivity and a short reaction time.

REFERENCES:
patent: 126669 (1984-11-01), None
patent: 474074 (1992-03-01), None
patent: 60-125251 (1985-07-01), None
patent: WO 97/43041 (1997-11-01), None
Cram et al.;Organic Chemistry2nd Edition; c. 1964 & 1959; pp. 218 and 427.

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