Publications by authors named "Gopaladasu T Venkanna"
The organometallic Ni(II) chemistry of the pyrrole-based pincer ligands, (PPyr) (PPyr = 2,5-(RPCH)CHN, R = Ph or Cy) is reported. Reactions of Grignard reagents with [NiCl(P Pyr)] afford a variety of alkyl and aryl complexes (methyl, ethyl, benzyl, phenyl, and allyl) that all display square planar geometries about nickel. The hydride complex, [NiH(PPyr)], can also prepared either through treatment of [NiCl(PPyr)] with LiHBEt, or by reaction of H(PPyr) with [Ni(COD)] (COD = 1,4-cyclooctadiene).
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- A new pincer ligand, (P(2)(Ph)Pyr)(-), was synthesized from pyrrole and can be oxidized to diphosphine oxide; it's stored as a borane adduct.
- Direct reaction of this ligand with NiCl(2) results in the formation of several nickel complexes, including [NiCl(P(2)(Ph)Pyr)], which all exhibit square-planar geometry and have been fully characterized.
- The nickel complexes show distinct electrochemical behavior, undergoing oxidation to nickel(III) and differing reduction outcomes based on the solvent used.
A novel reaction, the potassium hydride mediated synthesis of fulvenes, is described. The synthesis utilizes N-aryl imines as an inexpensive starting material affording novel substituted aminofulvenes. It is proposed that the presence of the metalated enamine as well as the imine (ratio 2 : 1) leads to the formation of an initial dimerization and a transient trimerization product, which cyclizes, giving rise to the aminofulvene.
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