Resolution of DL-cis and DL-trans chrysanthemic acid.

摘要

A process for resolving DL-cis or DL-trans chrysanthemic acid which comprises reacting the said acid with L or D N-methyl-ephedrine in an organic solvent, separating the L N-methyl- ephedrine salt of D-cis or D-trans chrysanthemic acid or the D N-methyl- ephedrine salt of L-cis or L-trans chrysanthemic acid thus crystallised and subjecting the said salt to acid hydrolysis whereby the desired D-cis or D-trans chrysanthemic acid or L-cis or L-trans chrysanthemic acid is obtained.