133 Synthesis and Structural Chemistry of Tris(triazolyl)Borate Ligands Based Zinc-Alkyl, -Alkoxide, -Phenoxide, and -Hydroxide Derivatives

Wednesday, November 4, 2009: 3:40 PM
Santa Fe (Camino Real Hotel)
Mukesh Kumar , Department of Chemistry, Drexel University, Philadelphia, PA
Elizabeth T. Papish , Department of Chemistry, Drexel University, Philadelphia, PA
Matthias Zeller , Department of Chemistry, Youngstown State University, Youngstown, OH
Tris(triazolyl)borate (Ttz) [TtzR,R′ = tris(3-R-5-R′-1,2,4-triazolyl)borate] ligands display structural similarities with well-known Tris(pyrazolyl)borate (Tp) [TpR,R′ = tris(3-R-5-R′-pyrazolyl)borate] ligands but are found to be different in electronic and solubility properties as evident from the recent reports from Papish’s group. We have been interested in the synthesis of transition-metal complexes of Ttz ligands and their biomimetic and catalytic chemistry. In this perspective, new organozinc complexes, TtzR,R′ZnR″ (R = Me, R= t-Bu, Ph; R″ = Et, Me) were prepared from the reaction of TlTtzR,R′ and ZnR″2. These zinc alkyl complexes were further reacted with alcohols, phenols, and carboxylic acids and their corresponding zinc alkoxide, phenoxide and ester derivatives were isolated and structurally characterized. Hydrolysis reactions of these derivatives involving Zn-R and Zn-OR groups were aimed to convert them to hitherto unknown TtzR,R′ZnOH complexes.