Fluoroaryl-substituted ketiminate complexes of aluminum

Ketiminate supported aluminum(III) complexes: Synthesis, characterization and reactivity

“…The bond length pattern of the ligand backbone is indicative of delocalization. In complex 2 it can be seen that non coordination of the pendent ethyl groups only slightly opens up the aluminum center as is evidenced by comparison of the NeAleO angles, 90.51 (11) and 91.49(7) in 1 and 2 respectively.…”

“…A nitrogen and oxygen atom occupy the axial positions with distorted geometry as evidenced by the NeAleO angle of 171.11 (11) that is deviated from the expected linear angle. The AleCl, AleO and AleN bonds show no noteworthy discrepancies from similar related species [9], in particular the related complex, [LAl(Me)Cl] [7b], but as expected the N1eAl bond is shorter than the N2eAl1 dative bond, (1.929(3) Å and 2.171(3) Å respectively).…”

Ketiminate‐Supported LiCl Cages and Group 13 Complexes

“…[6] Similar inability to isolate the mono-ketiminate product was observed in the synthesis of bis-(ketiminate)AlCl [ketiminate = MeC(O)CHC(Me)NHAr, Ar = p-C 6 H 4 F]. [7] The isolation of bis products in the previously reported cases highlights the inability of aryl-substituted bidentate ketiminate ligands to stabilize the metal center from further ligand attack, despite their steric bulk.…”

“…[23] The N( [23] 1 H NMR confirmed the assignment of a methyl carbon in the solid-state structures, with peaks corresponding to the Al-methyl at -0.68 ppm in each spectrum, which is in the normal range for N,O-chelated Al-CH 3 protons (-0.7 to -1.11 ppm). [24,25] Aluminum complexes of aryl-substituted ketiminate ligands have been reported, [6,7,25,26] so synthesis of a novel aluminum-ArL 1 complex was not pursued. However, the structure of 2 can be compared to previously reported Dipp-substituted ketiminate aluminum complexes.…”

“…Aluminum complexes continue to be an important presence in the field of catalysis [5][6][7] due to their strong Lewis acidity and low cost. [6] Of particular interest has been the partial hydrolysis reactions of aryl-and alkylaluminum compounds, [8][9][10][11][12] with the goal of mimicking methylalumoxane (MAO).…”