A 1,4-diamino-2,3-disila-1,3-butadiene derivative of composition (Me-2-cAAC)(2)(Si2Cl2) (Me-2-cAAC = :C(CMe2)(2)(CH2)N-2,6-iPr(2)C(6)H(3)) was synthesized by reduction of the Me-2-cAAC:SiCl4 adduct with KC8. This compound is stable at 0 degrees C for 3 months in an inert atmosphere. Theoretical studies reveal that the silicon atoms exhibit pyramidal coordination, where the Cl-Si-Si-Cl dihedral angle is twisted by 43.3 degrees (calcd 45.9 degrees). The two silicon-carbon bonds are intermediates between single and double Si-C bonds due to twisting of the C-Si-Si-C dihedral angle (163.6 degrees).