SYNTHESIS AND STRUCTURAL STUDIES OF FOUR- AND FIVE-COORDINATED MONOMERIC ALKYLALUMINUM O,N-CHELATE COMPOUNDS DERIVED FROM 2-AMINOACETOPHENONE - CRYSTAL AND MOLECULAR STRUCTURE OF THE FIVE-COORDINATED MEAL[O=C(ME)C6H4-2-NH](2) COMPLEX

摘要

The reaction of Me(3)Al with 1 and 2 equiv. of 2-aminoacetophenone yielded Me(2)Al[O=C(Me)C6H4-2-NH] (1) and MeAl[O=C(Me)C6H4-2-NH](2) (2), respectively. Compound 2 was also obtained in the reaction of 1 with 1 equiv. of 2-aminoacetophenone. The addition of 4-methylpyridine (py-Me) to 1 produced the Lewis acid-base adduct Me(2)Al[O=C(Me)C6H4-2-NH]. py-Me (3). The resulting compounds have been characterized by elemental analysis, cryometric molecular weight determination and H-1 and Al-27 NMR spectroscopy. These studies revealed that compound 1 has a four-coordinated chelate structure in solution, while 2 and 3 are five-coordinated monomeric complexes. The molecular structure of 2 has been confirmed by single-crystal X-ray crystallography. Copyright (C) 1997 Elsevier Science Ltd. [References: 13]