Abstract
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 ligands were liberated. For the most sterically encumbered complex, ( DippL)ZnEt ( 3, DippL = [(2,6- iPrC 6H 3)NC(CH 3)] 2CH −), a product assigned as the zinc-phosphide ( DippL)ZnPHPh ( 6) was observed but could not be isolated as a pure compound. A new, less bulky β-diketiminate complex ( TolL)ZnEt ( 2, TolL = [(p-CH 3C 6H 4)NC(CH 3)] 2CH −) was reacted with primary phosphines to give a precipitate and the bis( β-diketiminate)zinc complex ( TolL) 2Zn ( 5), an apparent product of comproportionation. ( MesAI)ZnEt ( 1, MesAI = MesNC(Me)(Et)C(Me) = NMes) and 2 were structurally characterized.
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