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29Si NMR spectra of tert-butyldimethylsilylated alcohols

✍ Scribed by Jan Schraml; Magdalena Kvíčalová; Vratislav Blechta; Jan Čermák

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
223 KB
Volume
35
Category
Article
ISSN
0749-1581

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✦ Synopsis

29Si NMR spectra of a series of tert-butyldimethylsilyl derivatives of simple alcohols were measured under standard conditions in chloroform-d. The chemical shifts are linearly related to those in analogous trimethylsilyl derivatives. The correlation is very good (r = 0.998, n = 24) but signiÐcantly di †erent from the correlation which holds for derivatives of amino acids (including both SiÈN and SiÈO silicon atoms) despite that the two correlations cover approximately the same range of chemical shifts. The quality of the correlation now reported (error estimate » 0.19 ppm) is such that it should allow the detection of speciÐc interactions that might occur in the case of silylated polyols. The observed chemical shifts are a †ected by polar e †ects and by sterically controlled association with the solvent (chloroform), but other factors are not excluded. 1997

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