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This work was conducted as part of our continuing effort to determine the factors that affect cation formation for organometallic aluminum complexes. In this study, the interactions of R2AlX (where R = Me, iBu, tBu; X = Cl, Br, I) with the monodentate bases thf, pyridine, NEt3, HNiPr2, H2NiBu, H2NtBu, and O=PPh3 are examined to determine the role of the base in cation formation. These reactions resulted in the neutral adducts of the general form R2AlX-base (1-6, 8, 10, and 12) as well as the cationic complexes [R2Al(base)2]X (7, 9, and 11). The reactions of Me2AlX (where X = Cl, Br) with PMDETA (N,N?,N?,N?-pentamethyldiethylenetriamine) and the catalytic activity of the resulting cationic complexes (13 and 14) are also discussed. All of the compounds were characterized by mp, IR, 1H-NMR, and elemental analyses, and in one an X-ray crystallographic study was carried out. X-ray data for 13: triclinic, P1, a = 6.9542(6) A, b = 12.2058(10) A, c = 13.2417(11) A, alpha = 106.236(2), beta = 98.885(2), gamma = 93.807(2), V = 1059.06(15) A3, and Z = 2 for 181 parameters refined on 4358 reflections having F > 6.0sigma(F), R = 0.0697, and Rw = 0.0697.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI