| 摘要 |
<p>A method of preparing (1R,cis)-2,2-dimethyl-3- (2,2-dichlorovinyl)cyclopropanecarboxylic acid (useful as the acid part of effective insecticidal esters) comprises reacting 2,2-dimethyl-3-(2,2-dichlorovinyl) cyclopropanecarboxylic acid containing 70% or more of the cis-form with an equimolar or lesser amount of (+)-1-phenyl-2-(p-tolyl)ethylamine, separating and, if necessary, purifying the resulting diastereomer salt, (which is a new compound) and decomposing said salt with a base or an acid to yield (1R,cis)-2,2-dimethyl-3- (2,2-dichlorovinyl)cyclopropanecarboxylic acid. The corresponding (1S,cis) acid may be obtained by using (-)-1-phenyl-2-(p-tolyl)ethylamine. </p> |
