The cyclic hydroboration of 2,7-dimethyl-2,6-octadiene (6) was studied. It
was found that the stereochemical outcome of the reaction was dependent upo
n the solvent, temperature, time and the nature of the borane reagent. Pure
racemic trans-2,5diisopropylborolane (14) was isolated following selective
complexation of the cis-2,5-diisopropylborolane (15) with 1-(2-hydroxyethy
l)-pyrrolidine.