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13C NMR Investigation of Si-alkylsubstituted 1,3,5-Trisilacyclohexanes

✍ Scribed by Ingvar Arnason

Publisher
John Wiley and Sons
Year
1998
Tongue
German
Weight
86 KB
Volume
624
Category
Article
ISSN
0372-7874

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✦ Synopsis

13

C NMR spectra of Si-alkylsubstituted derivatives of 1,3,5-trisilacyclohexanes have been recorded and analyzed. A systematic preparation of alkyl derivatives with mixed substituents made it possible to evaluate substituentinduced chemical shift (SCS) values for the ring carbon atoms in b and d position. It is found that the b e effect decreases in the order Me > Et > i-Pr > t-Bu. For the alkyl groups Me, Et, and i-Pr the b a effect is smaller than the b e effect. Axial SCS values for the t-Bu group are not accessible because chair conformations with an axial t-Bu group are unfavourable and tend to escape into a twisted boat form. The observed d effects are small and do not show any obvious tendencies.

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