SPECTROSCOPIC STUDIES ON THE STRUCTURE AND CONFORMATION OF LEWIS ACID ALDEHYDE COMPLEXES

被引:110
作者
DENMARK, SE
ALMSTEAD, NG
机构
[1] Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana
关键词
D O I
10.1021/ja00061a012
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The complexation of aldehydes with SnCl4 and BF3 has been studied spectroscopically. It was determined by HOESY analysis that the aldehyde-SnCl4 complexes examined prefer the E geometry. This preferential complexation is likely due to steric influences from the substituents on the aldehyde. A qualitative assessment of the relative basicity of various substituted aldehydes was also determined. It was found that both 2-heptynal and n-heptanal were significantly weaker Lewis bases than either (E)-2-heptenal or 4-tert-butylbenzaldehyde. The difference in basicity between (E)-2-heptenal and 2-heptynal is thought to arise from the electronegativity of the sp carbon atom. Finally the conformation of Lewis acid complexed and neutral (E)-2-heptenal was studied in solution. When complexed to either BF3 or SnCl4 or even uncomplexed, (E)-2-heptenal was determined by 1D-NOE studies to be in the s-trans conformation.
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页码:3133 / 3139
页数:7
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