The relative reactivities of Al-Al and Al-C bonds, Al2 (iB~) 4, have been examined employing the protonic reagents H30+, HCl (g), toluene-3, 4-dithiol, and HMII (CO)~ Excess H20, pH 1, results in 100% cleavage of both AI-A1 and A1-C bonds, whereas the A1-A1 bond exhibits