2-Acetyl-1,1,3,3-tetramethylguanidine

In the molecule of the title compound, C7H15N3O, the central C atom is surrounded in a nearly ideal trigonal–planar geometry by three N atoms. The C—N bond lengths in the CN3 unit are 1.3353 (13), 1.3463 (12) and 1.3541 (13) , indicating an intermediate character between a single and a double bond for each C—N bond. The bonds between the N atoms and the terminal C-methyl groups all have values close to that of a typical single bond [1.4526 (13)–1.4614 (14) ]. In the crystal, the guanidine molecules are connected by weak C—H...O and C—H...N hydrogen bonds, generating layers parallel to the ab plane.