Synthesis of 3,5-dichloroalkylbenzene and recovery of 1,3-dichlo

Details Synthesis of 3,5-dichloroalkylbenzene and recovery of 1,3-dichlo Synthesis of 3,5-dichloroalkylbenzene and recovery of 1,3-dichlo

1989-10-31

1991-07-09

Lone, Werren B.

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

Organic compounds

Halogen containing

570190, 570194, 570199, 570209, C07C 1712

Patent

active

050307770

ABSTRACT:
A process for synthesizing 3,5-dichloroalkylbenzene and recovering 1,3-dichlorobenzene from a starting mixture of 1,3- and 1,4-dichlorobenzenes. The process includes the sequential steps of selectively alkylating the 1,3-dichlorobenzene in the starting mixture; isomerizing a portion of the 2,4-dichloroalkylbenzene produced to 3,5-dichloroalkylbenzene; separating the 1,4-dichlorobenzene from the isomeric mixture of dichlorocumenes; and selectively transalkylating the dichlorocumenes to yield alkylbenzene, 3,5-dichloroalkylbenzene and 1,3-dichlorobenzene. By selectively alkylating only a portion of the 1,3-dichlorobenzene, the reaction products are obtained in good yield and substantially free of undesirable by-products.

REFERENCES:
patent: 2631172 (1953-03-01), Schmerling
patent: 4629815 (1986-12-01), Soula
patent: 4760209 (1988-07-01), Blank et al.
patent: 4822928 (1989-04-01), Ohtsura et al.

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