Method for the preparation of...

Details Method for the preparation of... Method for the preparation of...

2006-06-13

2006-06-13

Richter, Johann (Department: 1621)

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

Organic compounds

Halogen containing

C570S181000, C570S182000, C570S185000, C570S190000, C570S191000, C570S194000, C570S201000, C570S261000

Reexamination Certificate

active

07060862

ABSTRACT:
A method of synthesizing a high purity product of α,α,α′,α′-tetrachloro-p-xylene is disclosed. The method includes carrying out a first stage reaction of terephthaldicarboxaldehyde with a mixture of SOCl2and dimethylformamide (DMF) to obtain a product mixture containing α,α,α′,α′-tetrachloro-p-xylene as a major product and 4-dichloromethyl benzaldehyde as a side product; adding SOCl2and DMF to the product mixture of the first stage reaction to undergo a second stage reaction; and to a cool water adding the resulting product mixture from the second stage reaction to obtain a solid product of α,α,α′,α′-tetrachloro-p-xylene with a purity of 90-99 mol %.

REFERENCES:
Newman et al., J. Org. Chem., vol. 43, No. 22, 1978, pp. 4367-4369.

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