Title of article :
Synthesis, structure, and catalytic activity of organoaluminum complexes with chiral biaryl Schiff-base ligands
Author/Authors :
Zhao، نويسنده , , Ning and Wang، نويسنده , , Qiuwen and Hou، نويسنده , , Guohua and Song، نويسنده , , Haibin and Zi، نويسنده , , Guofu، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Pages :
8
From page :
128
To page :
135
Abstract :
A new series of organoaluminum complexes have been prepared by alkane elimination in good yields from AlMe3 and chiral biaryl Schiff-base NO2 ligands, 1H2-7H2, which are derived from (S)-2-amino-2′-hydroxy-1,1′-binaphthyl or (S)-2-amino-2′-hydroxy-6,6′-dimethyl-1,1′-biphenyl, respectively. However, solvent plays an important role in the formation of the aluminum complexes. For example, treatment of ligand 1H2 with 1 equiv of AlMe3 in THF gives the mononuclear complex (1)AlMe(THF) (8) in 90% yield. While reaction of 2H2, 3H2, 4H2, 5H2, 6H2 or 7H2 with 1 equiv of AlMe3 in benzene gives the binuclear complexes {(2)AlMe}2 (9), {(3)AlMe}2 (10), {(4)AlMe}2 (11), {(5)AlMe}2 (12), {(6)AlMe}2 (13) and {(7)AlMe}2 (14), respectively, in good yields. Complexes 8–14 have been characterized by various spectroscopic techniques, elemental analyses, and X-ray diffraction analyses. The complexes 8–14 are active catalysts for the polymerization of rac-lactide in the presence of isopropanol, leading to the heterotactic-rich polylactides.
Keywords :
NO2 ligand , Polymerization of lactide , Chiral organoaluminum complex , 1?-binaphthyl , 2-Amino-2?-hydroxy-1
Journal title :
INORGANICA CHIMICA ACTA
Serial Year :
2014
Journal title :
INORGANICA CHIMICA ACTA
Record number :
1323763
Link To Document :
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