Modelling nucleophilic substitution at silicon in solution, using hypervalent silicon compounds based on 2-pyridones
Modelling nucleophilic substitution at silicon in solution, using hypervalent silicon compounds based on 2-pyridones
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DOI：
10.1039/a904402g
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发表时间：
1999-10-01
期刊：
影响因子：
--
通讯作者：
Taylor, PG
中科院分区：
文献类型：
--
作者：
Bassindale, AR;Borbaruah, M;Taylor, PG
描述了一种在溶液中进行结构关联的新方法。研究了取代的2-吡啶酮的环碳的C-13化学位移是如何随氧与硅的络合而变化的，这使得可以在溶液中测定一些以2-吡啶酮为配体的五配位硅物种的%Si-O键的形成。用四配位和五配位极限情况的模型化合物，根据Si-29的化学位移确定了这些配合物的五配位百分数。%Si-O键的形成与%五配位的关联使硅上的取代路径能够在溶液中被绘制出来。使用一系列相关的芳香族配体考察了这些技术的一般性。
A novel method for performing structure correlations in solution is described. Examination of how the C-13 chemical shifts of the ring carbons of substituted 2-pyridones change on complexation of the oxygen with silicon has enabled the % Si-O bond formation to be determined in solution for a number of pentacoordinate silicon species with 2-pyridones as ligands. The % pentacoordination in these complexes has been determined from the Si-29 chemical shift using model compounds for the tetracoordinate and pentacoordinate limiting cases. Correlation of the % Si-O bond formation with % pentacoordination enables the pathway for substitution at silicon to be mapped in solution. The generality of these techniques is examined using a series of related aromatic ligands.