Process for preparing environmentally safe dicofol and its formu

Details Process for preparing environmentally safe dicofol and its formu Process for preparing environmentally safe dicofol and its formu

1990-11-08

1992-06-02

Lone, Werren B.

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

Organic compounds

Oxygen containing

568809, 568812, 568841, 568844, C07C 2974, C07C 2978

Patent

active

051188813

ABSTRACT:
The present invention provides for an improved practical process for producing DDTr-free p,p'-dicofol and its formulations substantially free of the practically inactive o-p'-dicofol comprising either directly recrystallizing technical dicofol from a suitable solvent such as acetic acid or alkanes, or alternatively preparing the p,p'-dicofol by the steps of (a) dehydrohalogenating technical DDT to give DDE; (b) chlorinating DDE to give Cl-DDT; and (c) hydrolyzing Cl-DDT to dicofol, wherein the technical DDT is initially recrystallized from a suitable solvent such as lower alkyl alcohols and then recrystallizing the ressulting p,p'-dicofol from a suitable solvent such as acetic acid or alkanes.

REFERENCES:
patent: 4705902 (1987-11-01), Nichols et al.

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