.pi.-Complexes of alkenes to trivalent aluminum

The structures of simple π-complexes of aluminum alkyls and aluminum alkyl halides were explored with use of ab initio molecular orbital theory. Complexes of AlR 3−n Cl n (R=H, CH 3 ) with ethylene and propene were found to be stable intermediates, not transition structures. The energies of binding have been estimated by using post-Hartree-Fock techniques