Method for racemization of optically active chrysanthemic acid d

Details Method for racemization of optically active chrysanthemic acid d Method for racemization of optically active chrysanthemic acid d

1988-04-28

1989-03-14

Killos, Paul J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260546, C07C 500

Patent

active

048122645

ABSTRACT:
Racemization of an optically active chrysanthemic acid derivatives of the formula: ##STR1## wherein X represents a chlorine atom, bromine atom or 2,2-dimethyl-3-isobutenyl-cyclopropane carboxyl group and * mark represents asymmetric carbon atom, is effected by contacting the acid derivatives with at least one compound selected from the group consisting of hydrogen bromide, a carboxylic acid bromide, an N-bromine compound, an S-bromine compound, a halobromine compound, a silicon-bromide compound, a phosphorus-bromide compound and an SH compound in the presence of a peroxide or an azo compound.

REFERENCES:
patent: 3285950 (1966-11-01), Weber
patent: 3786052 (1974-01-01), Martel
patent: 3989750 (1976-11-01), Nagase
patent: 4485257 (1984-11-01), Suzuhomo

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