Abstract
Linked bis(ketimine) ( 1) can be prepared with the reaction of excess 2,4-pentanedione and 4,4′-methylene-bis(2,6-diisopropylaniline) in methanol in the presence of catalytic amount of formic acid. The dialuminum alkyl complexes containing the linked bis(ketiminate) dianionic ligands, [OC(Me)CHC(Me)N(2,6- i Pr 2C 6H 2-4)AlR 2] 2CH 2 ( 2, R = Me; 3, R = Et), were prepared by a reaction of 2 equiv AlR 3 with [OC(Me)CHC(Me)NH(2,6- i Pr 2C 6H 2-4)] 2CH 2 in methylene chloride. Reactions of 2 with 2 and 4 equiv of I 2 gave corresponding aluminum iodo complexes 4 and 5, respectively. Treatment of 5 with 2 equiv of AgBF 4, however, gave a diboron complex, [OC(Me)CHC(Me)N(2,6- i Pr 2C 6H 2-4)BF 2] 2CH 2 ( 6), in 18% isolated yield. All new complexes have been characterized by 1H and 13C NMR spectroscopy and complexes 2, 3, and 6 are also confirmed by X-ray diffraction.
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