Process for preparing high cis 3-(2,2,2-trichloroethyl)-2,2-dime

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal

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260326A, 2603405R, 2603472, 260465D, 560124, 549 76, 549 77, 549 79, 549 60, 549 65, 549 66, C07C 6104, C07D30754

Patent

active

041660641

ABSTRACT:
A process is described whereby esters of 3-(2,2,2-trichloroethyl)-2,2-dimethylcyclopropane-1-carboxylic acid are prepared predominantly in their cis isomer form. The process comprises treating a 4,6,6,6-tetrachloro-3,3-dimethylhexanoate with an alkali metal tert-alkoxide under controlled conditions of temperature in the presence of a defined solvent-cosolvent mixture. The products of the process are intermediates in the production of pyrethroid insecticides.

REFERENCES:
patent: 3077496 (1963-02-01), Julia
Kondo et al., Synthetic Pyrethroids, ACS Symposium Series, No. 42, (1977), Chapter 12.
Itaya et al., Synthetic Pyrethroids, ACS Symposium Series No. 42, (1977), Chapter 4.

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