A variety of penta-2, 4-dienyl-and pent-2-en-4-ynylindium reagents have been prepared in situ from the reaction of the corresponding allylic bromides with indium metal, and their reactions with carbonyl compounds have been examined. The reaction with aldehydes gives the corresponding homoallyl alcohols in high yields. The coupling occurs regioselectively at the γ-position of these indium reagents. No α-and ϵ-coupling products ...
