10,10‐Dimethyl‐1,2,8‐thiadiazecan‐9‐one 1,1‐dioxide

The puckered ten-membered ring of the title compound, C9HI8N2O3S, contains a sulfonamide group and an amide moiety which has the trans conformation. The molecules are linked into infinite two-dimensional networks by intermolecular N-H...O hydrogen bonds involving both NH groups along with the amide O atom and one of the sulfonyl O atoms from different neighbouring molecules. The title compound was prepared by a ring-enlargement reaction of the corresponding N-aminoalkyl 1,2-thiazetidin-3-one 1,1-dioxide