The group 13 metal complexes of sterically-hindered substituted iminophenol: synthesis and structure

Abstract

The dimethyl derivatives of the group 13 metals I–IV were synthesized by interaction of N-(1-(5,7-di-tert-butyl-2-methyl-2,3-dihydrobenzo[d]oxazol-2-yl)ethylidene)-2,6-diisopropylaniline (a) with Me₃M (M = Al (I), Ga (II), In (III), Tl (IV)) in high yield. The obtained complexes were characterized by elemental analysis, ¹H NMR and IR spectroscopy. The structures of II–IV were determined by X-ray single crystal analysis. The compounds II–IV were found to be monomeric in the solid state due to the bulkiness of the tert-butyl and iso-propyl groups in contrast to similar derivatives reported previously.