The structure of )-2,8,9-trioxa-5-aza-1-silabicyclo[3.3.3]undecane, C1
4H19NO3Si, has been determined by X-ray analysis. The N-Si dative bond
length of 2.127 (4) Angstrom is in agreement with structural trends f
ound for such systems. The C atoms linked to the N atom are disordered
, an effect which has been observed in other silatrane structures.