摘要
The reactions of AlMe 3 with the tridentate pyrrole ligand precursor C 4 H 3 NH(2-CH=NCH 2 Py) and subsequent treatment of the derivatives with small organic molecules such as 2,6-diisopropylphenol or dibenzoylmethane were conveniently performed, and the products were characterized. The reaction between 1 equiv. of AlMe 3 and 1 equiv. of a pyrrole-imine-pyridine ligand in toluene affords [Al{C 4 H 3 N(CHNCH 2 Py)Me 2 }] (1) in high yield. In addition, the use of 2 equiv. of AlMe 3 with the same tridentate precursor results in the formation of a dialuminum compound [AlMe 3 {C 4 H 3 N(CHNCH 2 -Py)AlMe 2 }] (2) in moderate yield. Furthermore, the combination of 1 with either 1 or 2 equiv. of 2,6-diisopropylphenol or 2 equiv. of dibenzoylmethane in toluene yields aluminum monophenoxide or diphenoxide compounds [Al{C 4 H 3 N(CHNCH 2 -Py)Me(O-2,6-iPr 2 C 6 H 3 )}] (3) and [Al{C 4 H 3 N(CHNCH 2 -Py)}(O-2,6-iPr 2 C 6 H 3 ) 2 ] (4), respectively, as well as an aluminum bis-diketonate compound, [Al{C 4 H 3 N(CHNCH 2 -Py)}(PhCOCHCOPh) 2 ] (5). All of the aforementioned derivatives were characterized by 1 H and 13 C NMR spectroscopy, and their solid-state molecular structures were determined by single-crystal X-ray diffraction. The geometries of 1-5 show that the pyrrole ligand exists in the pyrrolyl-imine and azafulvene-amido resonance forms. Compounds 1, 3, 4 and 5 were used in the ring-opening polymerization of caprolactone in the presence of BnOH and in the catalytic Meerwein-Ponndorf- Verley (MPV) reaction of 1-naphthalenemethanol and 2-naphthalenecarbaldehyde. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.