Abstract
Attempted preparation of neutral hexacoordinate silicon chelates with two O→Si dative bonds (4), in analogy to previously reported bis-N→Si isomers (2), resulted in unexpected formation of pentacoordinate siliconium complexes (5 and 6), characterized by a crystal structure. The barrier for inversion of configuration at silicon was determined by selective inversion recovery NMR measurements: ΔG* = 20.5 ± 0.2 kcal mol-1.
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