Metal secondary amides derived from the highly hindered 2,4,6-tri-t-butylaniline; X-ray crystal structure of trans-[Li(µ-NHAr)(OEt2)]2(Ar = C6H2But3-2,4,6)

Abstract

Treatment of 2,4,6-tri-t-butylaniline (NH₂Ar) with LiBuⁿ in OEt₂ yields the white crystalline trans-[Li(µ-NHAr)(Oet₂)]₂, (2), which in turn furnishes the orange Sn(NHAr)₂(with SnCl₂) or a mixture of Ni^I/Ni^IIamides {using [Nil₂(PPh³)₂]} which with CO affords colourless crystalline cis-[Ni(Co)₂(NHAr)₂];the lithium amide(2) has a centrosymmetric four- membered planar LiNLiN ring with the substituents at N arranged in a transoid fashion: Li–N = 2.041(6) and 1.987(5)Å, Li–O = 1.906(5)Å, and ∠NLiN = 102.2(2)°