The reaction of dicyclopentadienylzirconium alkenyl chloride with a boron chloride or bromide results in the exchange of the halogen and alkenyl group, forming the alkenylborane. We report here a systematic investigation of the transmetalation of the 1-hexenyl group from zirconium to a variety of boron compounds. This group undergoes facile migration to a variety of boron compounds, yielding structurally different types of alkenylboranes in good to high yields. These results suggest that one can combine the unique reactivity and selectivity of hydrozirconation for the preparation of alkenylboranes.