Synthesis and Applications of low-coordinate cationic Organoaluminum and –gallium Compounds The combination of a low (two or three) coordination number with a positive charge at the metal center significantly increases the Lewis-acidity of the resulting compounds. The synthesis and stabilization of these species is achieved through the deployment of bulky and chemically robust m-terphenyl substituents and weakly coordinating anions such as [B(C₆F₅)₄]^-, [Al(OR_f)₄]^- or carboranes [CHB₁₁Cl₁₁]^-. Details of their syntheses and structures will be presented, and their stabilities and reactivities will be discussed. For example, the cation [2,6-Dipp₂C₆H₃Ga(n-Bu)]⁺ slowly alkylates benzene in the presence of excess 1-octene.