Abstract Lithylated bis (trimethylsilyl) hydrazines, Li2N2 (SiMe3) 2 and LiH N2 (SiMe3) 2 react with (Me3Si) 2NECI2 (E˭ P or As) to form hetero atom incorporated tetrazenes, 1, 3.4, 4-tetrakis (trimethyIsilyl)-2-phospha-I-tetrazene (Me3Si) 2N‒N (SiMe3)‒P˭ NSiMe3 and 1, 1, 4, 4-tetrakis-(trimethylsilyl)-2-arsa-2-tetrazene (Me3Si) 2N‒N˭ As‒N (SiMe3) 2. The former thermolyses primarily into trisila-phosphatriazene (Me3Si) 2N‒P˭ NSiMe3 and ...