Synthesis and crystal structures of novel 1-aza-2-silacyclobut-3-enes
Abstract
A crystallographic re-investigation of the structure of the 4-aryl(lithio)amino-1-aza-2-silacyclo-but-3-ene derivative, [Li{N(Ar)CC(R)SiR2N
Ar}](tmen) F (R = SiMe3, Ar = C6H3Me2-2,6), formed by the treatment of [Li(SiR3)(thf)3] with ArNC in the presence of tmen, revealed the presence of two independent molecules within the unit cell. Its protonolysis with
CC(R)Si(R)2N
Ar 2b. Replacing tmen with
CC(R)Si(R)2N
Ar}(thf)2] 4 or the dimer [Li{N(Ar)
CC(R)Si(R)2N
Ar}(μ-dmpe)]23, the latter being preferred at low thf concentrations. Each of the compounds F, 2b, 3 and 4 was characterised by multinuclear
C
CSiN
compound and a neutral