The reaction of boron chloride with trialkylboroxines has been found to provide a new general method for the preparation of alhyldichloroboranes. The normal alkyl compounds, ethyl-through hexyl-, isopropyl-, isobutyl-, sec-butyl-, t-butyl-and cyclohexyl-have been prepared, purified and characterized. Fractional distillation at their normal boiling points causes no disproportionation of these compounds. The alkyldichloroboranes are more ...