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|標題:||Synthesis and characterization of aluminum ethyl-(S)-lactate complexes and VT NMR studies of (Bu2Al)-Al-i((S)-(-)-mu(2)-OC(H)(Me)C(O)OEt)) (2)||作者:||Ko, B.T.
|關鍵字:||aluminum;alkoxide;ethyl-(S)-lactate;fluxional;diels-alder reaction;crowded aryloxide compounds;spectroscopic;investigations;alkylaluminum compounds;crystal-structures;lewis-acids;x-ray;derivatives;reagents||Project:||Polyhedron||期刊/報告no：:||Polyhedron, Volume 17, Issue 23-24, Page(s) 4257-4264.||摘要:||
The reactions of ethyl-(S)-(-)-lactate with R3Al in diethyl ether yield the pentacoordinated complexes [R2Al((S)-(-)-mu(2)-OC(H)(Me)C(O)OEt))](2) (1: R = Me; 2: R = Et; 3: R = Bu-i). These compounds have been characterized by spectroscopic studies as wells as crystallographic method. These structures show dimeric features containing unusual 5.4.5-fused rings with an Al2O2 core and the ester group bonded to Al through the C=O. VT NMR studies of compound 3 suggest that the weak (C=O)-->M dative bond may undergo dissociation in solution, giving rise to the equilibrium with a four-coordinate species among two five-coordinate species at ambient temperature. (C) 1998 Elsevier Science Ltd. All rights reserved.
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