Nickel-Catalyzed Homoallylation Reaction of Aldehydes with 1,3-Dienes: Stereochemical and Mechanistic Studies

[reaction: see text] Contrary to what was reported, the coupling reaction of nickel-catalyzed cyclic diene such as cyclohexadiene with carbonyl compounds in the presence of diethyl zinc afforded gamma,delta-alkenyl alcohols in good yields.