Add time:08/11/2019         Source:sciencedirect.com

In contrast to the structure of bis(trimethylsilyl) amides, which, except for the formamide, exist in the imidate form and undergo rapid exchange of trimethylsilyl groups, the bis(dimethylsilyl)amides prepared in this study exist in the amide form and undergo rapid rotation around the CN bond. The reaction of several bis(trimethylsilyl) amides with 1,2-bis(dimethylchlorosilyl)ethane also produced amides containing a 5-membered silazane ring. Structures were determined by 13C, 29Si, 14N, and 17O NMR, and free energies of activation for hindered rotation were determined by variable temperature 13C or 29Si NMR. The difference in structure can be attributed to the spatial requirements of the groups attached to silicon.

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