Preparation of 2,4,5-trichlorophenol and 2,4,5-trichlorophenoxya

Details Preparation of 2,4,5-trichlorophenol and 2,4,5-trichlorophenoxya Preparation of 2,4,5-trichlorophenol and 2,4,5-trichlorophenoxya

1981-05-22

1982-08-24

Lone, Werren B.

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

Organic compounds

Oxygen containing

568774, C07C 3932

Patent

active

043462480

ABSTRACT:
A process for the preparation of 2,4,5-trichlorophenol and 2,4,5-trichlorophenoxyacetic acid free of 2,3,7,8-tetrachloro-dibenzo-p-dioxin contamination by the steps of nitrating 1,2,4-trichlorobenzene, reducing the resulting 1,2,4-trichloro-5-nitrobenzene, diazotizing the resulting 2,4,5-trichloroaniline, hydrolyzing the resulting 2,4,5-trichlorobenzenediazonium salt and recovering 2,4,5-trichlorophenol. The 2,4,5-trichlorophenol is reacted with monochloroacetic acid to give 2,4,5-trichlorophenoxyacetic acid. Both the 2,4,5-trichlorophenol and the 2,4,5-trichlorophenoxyacetic acid produced by the process are analytically free of 2,3,7,8-tetrachloro-dibenzo-p-dioxin in analytical tests sensitive to 1 part per billion.

REFERENCES:
patent: 3914325 (1975-10-01), Gavin et al.
patent: 3919332 (1975-11-01), Wollensak
patent: 4216342 (1980-08-01), Virgilio et al.

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