Resolution of D,L-cis and D,L-trans 2,2-dimethyl-3-(2,2-dihalovi

Details Resolution of D,L-cis and D,L-trans 2,2-dimethyl-3-(2,2-dihalovi Resolution of D,L-cis and D,L-trans 2,2-dimethyl-3-(2,2-dihalovi

1980-03-17

1982-05-04

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

562401, C07C 6116, C07B 1900

Patent

active

043281737

ABSTRACT:
A novel process for the resolution of D,L-cis and D,L-trans 2,2-dimethyl-3-(2,2 -dihalovinyl)-cyclopropane-1-carboxylic acids of the formula ##STR1## wherein X is selected from the group consisting of fluorine, chlorine and bromine comprising salifying the said acid with an optically active base selected from the group consisting of D-ephedrine, L-ephedrine, D-N-methyl-ephedrine, L-N-methylephedrine, D-pseudo-ephedrine and L-pseudo-ephedrine to form the corresponding salt, recovering the said salt and subjecting the latter to acid hydrolysis to obtain the corresponding resolved acid which are intermediates for the synthesis of esters having a remarkable insecticidal activity.

REFERENCES:
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patent: 3739019 (1973-12-01), Horiuchi et al.
patent: 3842125 (1973-06-01), Ueda et al.
patent: 3879451 (1975-04-01), Yoshioka et al.
patent: 4014918 (1977-03-01), Martel
patent: 4024163 (1977-05-01), Elliott et al.
patent: 4229593 (1980-10-01), Kondo et al.

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