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

Abstract

There is considerable interest in organoaluminum compounds containing AlÀO bonds. This is primarily due to the discovery of methylalumoxane (MAO) as an extremely potent cocata-

Mononuclear Aluminum Hydroxide for the Design of Well-Defined Homogeneous Catalysts

“…This result is similar to that observed for 2 ( δ −0.30 ppm). It is noteworthy that on one hand the OH group of 5 is reactive enough to react with Cp 2 ZrMe 2 and Cp 2 ZrHCl to yield 6 and 7 as described, as well as with AlH 3 ·NMe 3 and GaH 3 ·NMe 3 , on the other, it does not impede the formation of 5 during the course of the reaction as it does not eliminate methane, presumably kinetic stability disfavors intermolecular methane evolution due to the sterically encumbered β-diketiminato ligand.…”

Synthesis and Structural Characterization of Heterobimetallic Bismuth Complexes with Main Group and Transition Metals

“…Elemental analyses were performed at the Analytical Laboratory of the Institute of Inorganic Chemistry at Göttingen. LMeM(OH) (M = Al, Ga), , LGe(OH), (L = CH(NAr(CMe)) 2 , Ar = 2,6- i Pr 2 C 6 H 3 ), Cp* 2 MeZr(OH), and [1,8-C 10 H 6 (NSiMe 3 ) 2 BiNMe 2 ] ( 1 ) were prepared according to literature procedures.…”

Trinuclear Alumoxanes with an Acyclic Al‐O‐Al‐O‐Al Core and Studies of Their Reactivity

“…The AlO bonds in the (AlO) 2 ring (av 1.8493 Å) are shorter than the average distance (1.865 Å) for the ring AlO bonds in [(( t Bu) 2 Al{ μ ‐OAl( t Bu) 2 }) 2 ]4 and a little longer than that in a coordination polymer containing dimeric [{Me 2 Al( μ ‐O)AlMe 2 } 2 ] alumoxane units (av 1.8295 Å) 15. It is interesting to note that compound 7 is a methyl‐substituted analogue of the tetranuclear alumoxane [{LAlMe( μ ‐OAlH 2 )} 2 ] that carries two hydrogen atoms on each aluminum atom in the ring 16. Compound [{LAlMe( μ ‐OAlH 2 )} 2 ] features a cis arrangement of two methyl groups on the terminal Al atoms,16 while their equivalent in 7 is trans with respect to each other.…”

“…This feature highly resembles the cage-opened product of [15] It is interesting to note that compound 7 is a methyl-substituted analogue of the tetranuclear alumoxane [{LAlMeA C H T U N G T R E N N U N G (m-OAlH 2 )} 2 ] that carries two hydrogen atoms on each aluminum atom in the ring. [16] Compound [{LAlMeA C H T U N G T R E N N U N G (m-OAlH 2 )} 2 ] features a cis arrangement of two methyl groups on the terminal Al atoms, [16] while their equivalent in 7 is trans with respect to each other. The structural features of [{LAlPhA C H T U N G T R E N N U N G (m-OAlMe 2 )} 2 ] (8, Figure S3 in the Supporting Information) are highly analogous to those of 7.…”