Stereospecific lithium-halogen exchange of alkenyl iodides was performed upon treatment with butyllithium in non-polar solvents such as hexane, benzene, and toluene at 25° C to provide alkenyllithiums quantitatively with retention of the configuration. Metal-iodine exchange of allenyl iodides with n-BuLi, i-PrMgBr or Et2Zn was also performed effectively to afford the corresponding allenylmetallic reagents. An addition of carbonyl compounds to ...
