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Synthesis and Structure of (CH3 Si)6 (NH)9 : A Si-N Cage Made from Methyltrichlorosilane and Ammonia.

No bulky substituents are bonded to the silicon centers of the cagelike title compound 1, which is readily formed by reaction of methyltrichlorosilane with ammonia and sodium. According to X-ray structure analysis, 1 consists of two Si3 N3 rings in the chair conformation that are bridged through the silicon centers by NH groups. The result is a cage in which three bars are missing, as can be seen on the right.