One and a half decades ago the formation of Si₂Cl₄ from the intermediate species SiCl₂ was theoretically predicted to be exothermic. The hypothetical Si₂Cl₄ has never been experimentally synthesized and isolated. Herein, we report that the Si₂Cl₄ species was stabilized as singlet biradical (Cy-cAAC·)₂Si₂Cl₄ utilizing two cAAC (cyclic alkyl(amino) carbene). This compound is stable, isolable, and storable at rt under an inert atmosphere. The electronic structure and bonding were studied by theoretical calculations which revealed that the molecule possesses a singlet biradical ground state with an unpaired electron on each carbene C atom having opposite spin.