Abstract: The kinetics of inversion of the Grignard reagents RMgX (R= 2-methylbutyl, X= C1, Br, I, R, Mg) have been investigated and molecular weight data obtained for ether solutions 0.1-0.15 M. It has been found that steric effects have relatively little influence on the rates of inversion. Reagents which are dimeric X= C1 give first-order kinetics while, for those which are monomeric, the inversion rates are second order in contained reagent. It is concluded ...