Abstract The preparation of several 1, 3-dimethyl-2-(azol-l′-yl)-1, 3, 2- diazaboracyclohexanes is described and their NMR spectra are interpreted. The reaction of 2-(pyrazol-1′-yl)-1, 3, 2,-diazaboracyclohexanes with pyrazoles was found to lead to 1/1 molar adducts which exist in equlibrium with the uncomplexed species, whereas B- tetraalkylpyrazaboles are obtained on reaction with (dimethylamino) dialkylboranes. ...