Reaction of ZnCl2 with MeN(Me2SiNEtLi)2 results in the formation of the first stable six-membered Si2N3Zn metallacycle. Spectral and X-ray crystal structure studies of this compound, crystallized from toluene-pyridine mixtures, indicate the molecule to be dimeric in nature with the formula [MeN(Me2SiNEt)2Zn.py]2 (py = pyridine). The Zn atom is tetrahedrally coordinated, and pyridine and three of the nitrogens bonded to ethyl groups are involved in the coordination.