Transition metal σ-complexes in organic synthesis

Aryl organomanganese compounds ArMnX and Ph3MnLi (Ar=Ph, p-MeC6H4, p-MeOC6H4, p-ClC6H4, p-BrC6H4, α-naphthyl; X=Cl, Br) react with alkenyl iodides RR1C=CR2I (R=H, Pr, Bu, i-Bu, C6H13, CH2=CHCH2, Ph; R1=H, Pr, C5H11; R2=H, Pr, SiMe3) in THF at 0–20°C to give cross-coupling products RR1C=CR2Ar in high yields.