The reaction of primary alkyl bromides or chlorides with diethylzinc in the presence of Ni (acac) 2 (5 mol%) furnishes the corresponding alkylzinc halides (X= Br, Cl) via a halogen- zinc exchange reaction. The treatment of terminal alkenes with diethylzinc (neat, 25-60° C) in the presence of Ni (acac) 2 as a catalyst (1-5 mol%) and 1, 5-cyclooctadiene (COD) affords the corresponding dialkylzincs via a hydrozincation reaction. Whereas the ...
