Hydrolytic synthesis of an alumoxane hydride bearing terminal pyrazolato ligands

The novel alumoxane hydride [(mu -n(1):n(1)-3,5-tBu(2)pz)2(eta (1)-Bu(2)pz) (2)(mu (3)-O)(mu -Al)(3)H-2]. 2THF (2; 3,5-tBu(2)pz = 3,5-tert-butylpyrazol ato) is formed when aluminum dihydride [(mu -n(1):n(1)-3,5-tBu(2)pz)(mu -Al )H-2](2) (1) reacted with I equiv of water. The core of compound 2 consists of two tetra- and one hexacoordinated Al atoms with short Al-O bonds. The two central Na2Al2O ring systems share a common Al-O edge with a hexacoordi nated Al atom, and two of the pyrazolato ligands bind in an n(1) and mu -n( 1):n(1) arrangement.