Method for racemization of optically active chrysanthemic acid o

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

1988-03-09

1989-04-11

Shippen, Michael L.

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

Organic compounds

Carboxylic acid esters

562401, 562506, C07C 51353

Patent

active

048208647

ABSTRACT:
Racemization of an optically active chrysanthemic acid or its ester of the formula: ##STR1## wherein R represents a hydrogen atom, an alkyl group of 1-20 carbon atoms, a cycloalkyl group of 3-20 carbon atoms or an aralkyl group of 7-20 carbon atoms and * mark indicates asymmetric carbon atom, is effected by contacting the acid or its ester with at least one compound selected from the group consisting of a carboxylic acid bromide, a silicon bromide, an S-bromine compound, and N-bromine compound, a halo-bromine compound and an SH compound in the presence of a peroxide or an azo compound.

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