Investigations of polymerizations and metathesis reactions

Cycloaddition reactions of titanium and zirconium imido, oxo and hydrazido complexes supported by tetraaza macrocyclic ligands ‡

“…63 We note also that triazatrimethylene (N,NЈ,NЉ-triarylguanidine) intermediates are implicated (but have never been observed) in the carbodiimide metathesis reactions of [W(NR)Cl 3 (µ-Cl)] 2 and [V(NTol)X 3 ] (X = Cl or OBu t ). 47,64 Comparative reactions of the titanium oxo complexes [Ti(O)(Me n taa)] (n ‫؍‬ 4 or 8)…”

Catalytic CN bond metathesis of carbodiimides by group 4 and 5 imido complexes supported by guanidinate ligands

“…(1)). [1][2][3][4][5][6] Transition metal imido species have been implicated as catalyst precursors for this reaction, however, only Cp 2 (THF)Zr(NN t Bu) has also been shown definitively to proceed by a sequential addition/elimination pathway (Scheme 1). 1 We are developing the reactivity of complexes that are supported by guanidinate anions, [RARBNC(NR) 2 ] 2 , [7][8][9] and recently reported the catalytic abilities of the guanidinatesupported imido complexes [{(Me 2 N)C(N i Pr) 2 } 2 TiNNArA] (ArA = 2,6-Me 2 C 6 H 3 1a; C 6 F 5 1b) for C-N bond transformations.…”

Catalytic CN Bond Formation by Metal-Imide-Mediated Imine Metathesis

“…This zirconium imide complex reacts with imines to form diazametallacycles that undergo further metathetical exchange with external imines. , Although catalytic and relevant to our studies, the tendency of the zirconium imide products to dimerize decreases the practical utility of the system. All other examples of metathetical reactions involving a CN bond involve the more activated substrates, isocyanates and carbodiimides. , Imide/imide metathesis was originally documented for molybdenum bis(imide) complexes by Gibson et al. , …”