Tetranuclear Homo‐ and Heteroalumoxanes Containing Reactive Functional Groups: Syntheses and X‐ray Crystal Structures of [{[LAl(Me)](μ‐O)(MH₂)}₂]

A core with corners: The first alumoxane containing an {Al4O2} core as well as a gallium congener with an {Al2Ga2O2} core are prepared by the reaction of an organoaluminum monohydroxide with MH3⋅NMe3 (see formula; M=Al, Ga; Ar=2,6-iPr2C6H3). These compounds contain reactive hydride groups on the central M2O2 rings and methyl groups on the terminal aluminum atoms.