Yttrium complexes incorporating the chelating diamides {ArN(CH2)xNAr}2− (Ar = C6H3-2,6-iPr2, x = 2, 3) and their unusual reaction with phenylsilane

Abstract

Novel yttrium chelating diamide complexes [(Y{ArN(CH₂)_xNAr}(Z)(THF)_n)_y] (Z = I, CH(SiMe₃)₂, CH₂Ph, H, N(SiMe₃)₂, OC₆H₃-2,6-^tBu₂-4-Me; x = 2, 3; n = 1 or 2; y = 1 or 2) were made via salt metathesis of the potassium diamides (x = 3 (3), x = 2 (4)) and yttrium triiodide in THF (5, 10), followed by salt metathesis with the appropriate potassium salt (6–9, 11–13, 15) and further reaction with molecular hydrogen (14). 6 and 11 (Z = CH(SiMe₃)₂, x = 2, 3) underwent unprecedented exchange of yttrium for silicon on reaction with phenylsilane to yield (Si{ArN(CH₂)_xNAr}PhH) (x = 2 (16), 3) and (Si{CH(SiMe₃)₂}PhH₂).