Structural Diversity of Tris(2‐hydroxyaryl)methane‐Derived Aluminium Complexes

Tris(2‐hydroxyaryl)methane ligands coordinate to main group and transition metals in a variety of modes. However, for aluminium, only trinuclear complexes have previously been reported. To investigate the possibility of also developing both mono‐ and dinuclear aluminium complexes, the reactions of Et 3 Al and tris(2‐hydroxyaryl)methanes have been examined under various conditions. In this work, trialuminium complex 1b was formed by disproportionation of the initially generated monomeric complex 2′ (Al/ligand = 1:1) with Et 3 Al. This reaction allowed us to selectively synthesize aluminium complexes 1b , 2 , 5 , and 7 with different coordination modes. Furthermore, mononuclear complex 5b underwent rearrangement to yield the tris(aryloxy) complex 8 in C 6 D 6 under the appropriate conditions.