Process of preparation of alkyl esters of dl cis chrysanthemic a

Details Process of preparation of alkyl esters of dl cis chrysanthemic a Process of preparation of alkyl esters of dl cis chrysanthemic a

1979-07-20

1980-11-11

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

560124, B01J 1908

Patent

active

042331293

ABSTRACT:
A process for the production of an alkyl ester of dl cis chrysanthemic acid having the formula ##STR1## wherein R is an alkyl having from 1 to 6 carbon atoms, involving preparing a lithiated derivative of 2-methyl-pent-2-en-4-yne, reacting the same with an alkyl chloroformate, optionally reducing the acetylenic bond to an ethylenic bond, reacting the alkyl ester with diazo-2-propane, irradiating or heating the resultant pyrazole carboxylate and, if not previously reduced, subjecting the resultant cyclopropane carboxylate to the action of a reducing agent.

REFERENCES:
patent: 3657086 (1972-04-01), Matsui et al.
patent: 3674832 (1972-07-01), Sherlock et al.
patent: 4085273 (1978-04-01), Peterson et al.

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