A Pyridine‐Stabilized Alumoxane Containing Two 1,3,2‐Diazaalumina[3]ferrocenophane Units

Dialuminoxane 6 , in which both aluminum atoms are coordinated by pyridine and each is part of a 1,3‐bis(trimethylsilyl)‐1,3,2‐diazaalumina[3]ferrocenophane unit, was isolated as a side product accompanying the synthesis of the corresponding [3]ferrocenophane with Al–H or Al–Cl functionalities. Although attempted high‐yield syntheses of 6 failed, its structure could be established by 1 H, 13 C, and 29 Si NMR spectroscopy in solution and by X‐ray structural analysis in the solid state. In various experiments to obtain 6 , crystalline material was isolated and identified as the desired dialuminoxane either with a linear Al–O–Al ( 6A ) or bent Al–O–Al ( 6B ) unit. This is the first example of a structurally characterized bis(amino)dialuminoxane.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)