Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34301
標題: Electronic and steric factors affecting the formation of four or five-coordinated aluminum complexes: syntheses and crystal structures of some aluminum alkoxides
作者: Lin, C.H.
林助傑
Ko, B.T.
Wang, F.C.
Lin, C.C.
Kuo, C.Y.
關鍵字: aluminum
ether alcohol
bifunctional
2-phenoxyethanol
2-methoxybenzyl
alcohol
diels-alder reactions
alkylaluminum
derivatives
spectroscopy
reagents
ketones
amides
al
期刊/報告no:: Journal of Organometallic Chemistry, Volume 575, Issue 1, Page(s) 67-75.
摘要: The reaction of 2-phenoxyethanol with AlX3 affords a five-coordinated dimeric product [(mu-OCH2CH2OPh)AlX2](2) (1, X = Cl; 2, X = Br) in high yields. However, the reaction of 2-phenoxyethanol with Al(Bu-i)(3), yields a four-coordinated dimeric product [(mu-O(CH2)(2)OPh)Al(Bu-i)(2)](2), (3). A mixture, [(mu-O(CH2)(2)OPh)Al(Et)(0.75)(Cl)(1.25)](2) (4) is Obtained from the reaction of 2-phenoxyethanol with one equivalent of Et2AlCl. The reaction of 2-methoxybenzyl alcohol with AlR3 gives a semi-pentacoordinated dimeric product [(mu-OCH2C6H4OMe)AlR2](2) (5, R = Me; 6, X = Bu-i) in high yields. Crystal structure studies of these compounds reveal that the distance between Al and the phenoxy oxygen or the methoxy oxygen is 3 > 6 > 5 much greater than 4 > 1 similar to 2. Although both the electronic and steric effect influence the nature of the O,O'-bifunctional ligand chelating on the aluminum center to generate a five- or four-coordinated aluminum, the electronic effect is considered to play a major role. The interaction of aluminum and ethereal oxygen can be monitored by C-13-NMR spectroscopic studies. (C) 1999 Elsevier Science S.A. All rights reserved.
URI: http://hdl.handle.net/11455/34301
ISSN: 0022-328X
文章連結: http://dx.doi.org/10.1016/s0022-328x(98)00968-1
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