Reaction of Me3Al (one equivalent) with the bis(imino)phenol, [2,6-(ArNCH)2-4-MeC6H2OH]
(I)
(Ar = 2,6-Pri2C6H3) in toluene at ambient temperature yields the yellow complex {Me2Al[2,6-(ArNCH)2-4-MeC6H2O]}
(1). Interaction of two equivalents of Me3Al in refluxing toluene affords the red complex {(Me2Al)2[2-ArNCH(Me)-6-(ArNCH)-4-MeC6H2O]}
(2). Similar interaction (two equivalents, refluxing toluene) of MeAlCl2 or iBu3Al with [2,6-(ArNCH)2-4-MeC6H2OH] affords {ClAl[2,6-(ArNCH)2-4-MeC6H2O]2}
(3) or {iBu2Al[2,6-(ArNCH)2-4-MeC6H2O]}
(4), respectively. Hydrolysis of 2 readily affords the iminoaminophenol ligand [2-(ArN
CH)-6-ArNHCH(Me)-4-MeC6H2OH]
(II), which reacts further with Me3Al to afford {Me2Al[2-ArNCH(Me)-6-(ArNCH)-4-MeC6H2O]}
(5). An X-ray study on 1 reveals bidentate imino-alkoxide ligation about the distorted aluminium centre, whereas 2 is a binuclear structure with tetrahedral aluminiums ligated by imino-alkoxide and amido-alkoxide ligand fragments, respectively. For 2 and 3 bidentate imino-alkoxide ligation is observed.
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