Abstract
AbstractA 300‐MHz 1H‐NMR conformational analysis study of a set of pentacoordinated silicon compounds (silatranes) and their tetracoordinated counterparts is presented. The solution conformation of the silatranes shows a close resemblance to known X‐ray structures, although the silatrane conformation was found to depend upon the solvent polarity. Comparison of the conformation of a 2‐methoxyethoxy fragment in the tetra‐ and pentacoordinated systems showed the existence of conformational transmission, similar to that known for phosphorus compounds. Enhanced electrostatic repulsion between the vicinal oxygens in the 2‐methyoxyethoxy fragment produces a trans conformation around the CC bond in the pentacoordinated silatranes. The conformational transmission effect is smaller in silatranes than in phosphorus compounds, due to a relatively weak fifth bond.
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