New zinc complexes of chelating monoanionic N-donors and neutral diphosphine ligands were synthesized by reaction of diethylzinc with 1,3-diketimine, diazabutadiene, and diphosphine ligand precursors. These complexes were reacted with primary phosphines in an attempt to solicit phosphine dehydrocoupling reactivity. In most cases, insoluble zinc-containing precipitates were formed and ancillary ligands were lost. For the most sterically encumbered complex, (DippL)ZnEt (3  , DippL = [(2,6-iPrC6H3)NC(CH3)]2CH�), a product assigned as the zinc-phosphide (DippL)ZnPHPh (6  ) was observed but could not be isolated as a pure compound. A novel, less bulky �-diketiminate complex (TolL)ZnEt (2  , TolL = [(p-CH3C6H4)NC(CH3)]2CH�) was reacted with primary phosphines to give a precipitate and the bis(�-diketiminate)zinc complex (TolL)2Zn (5  ), an apparent product of comproportionation. (MesAI)ZnEt (1  , MesAI =   MesNC(Me)(Et)C(Me)=NMes-), [dmpe]ZnEt2 (4  , dmpe = 1,2-bis(dimethylphosphino)ethane), 5  , and 2  were structurally characterized.

Synthesis and characterization of novel zinc complexes and reactivity towards primary phosphines

243rd National Meeting (2012)

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