. . . . . . . "Crystal structures of adducts between MeLi and PhLi and a (+)-sparteine surrogate have been determined to reveal a 2:2 MeLi dimer and a 4:2 PhLi ladder structure, each capped by two of the diamine ligands." . . . "The crystal structures of aggregates betweenMeLi and PhLi and a (+)-sparteine surrogate ((+)-2)have been determined. The MeLi adduct 4 reveals a 2:2dimer, while the PhLi adduct 6 forms a rare example ofa 4:2 ladder structure, each capped by two of the diamineligands. The observation that (+)-2 is equally effectiveas (\u2212)-sparteine in s-BuLi-mediated asymmetric deprotonations, but leading to the opposite sense of stereoselectivity, is explained on the basis of the crystal structuresand a computational study. Moreover, the crystal structure of the 2;2 dimer between MeLi and (\u2212)-sparteinehas been redetermined with advanced accuracy." . "Crystal Structures of (+)-Sparteine Surrogate Adducts ofMethyllithium and Phenyllithium" . . . . . . . . . .