Lithiation of (tBuNH)3PNSiMe3 and Formation of Tetraimidophosphate Complexes Containing M3O3 Rings (M = Li, K): X-ray Structure of the Stable Radical {(Me3SiN)P(μ3-NtBu)3[μ3-Li(THF)]3(OtBu)}

The reaction of ((t)BuNH)(3)PNSiMe(3) (1) with 1 equiv of (n)BuLi results in the formation of Li[P(NH(t)Bu)(2)(N(t)Bu)(NSiMe(3))] (2); treatment of 2 with a second equivalent of (n)BuLi produces the dilithium salt Li(2)[P(NH(t)Bu)(N(t)Bu)(2)(NSiMe(3))] (3). Similarly, the reaction of 1 and (n)BuLi in a 1:3 stoichiometry produces the trilithiated species Li(3)[P(N(t)Bu)(3)(NSiMe(3))] (4). These three complexes represent imido analogues of …