Deprotonation of metal complexes derived from ligands containing pyrrole, pyrazole, and indene residues was written by Chiswell, B.. And the article was included in Inorganica Chimica Acta in 1972.Formula: C9H9N3 This article mentions the following:
The synthesis of several new planar nitrogenous tridentate ligands, specially designed to present their donor atoms at positions very close to the normal octahedral sites of a metal atom, are described. Each of these ligand moieties, when complexed to a metal atom, also possess the potential ability to lose a proton from the periphery of the ligand mol. to yield deprotonated non-charged metal complexes. The lack of change in color and magnetic moment of complexes of these ligands, upon undergoing such deprotonation reactions, is compared with the marked increase in color intensity and decrease in magnetic moment when charged complexes containing a 2-pyridylhydrazine entity in the ligand residue undergo similar deprotonation reactions. In the experiment, the researchers used many compounds, for example, 2-(5-Methyl-1H-pyrazol-3-yl)pyridine (cas: 19959-77-4Formula: C9H9N3).
2-(5-Methyl-1H-pyrazol-3-yl)pyridine (cas: 19959-77-4) belongs to pyrazole derivatives. Pyrazole has two ring nitrogen atoms in which N1 is pyrrolic and N2 is pyridine-like. The N1 nitrogen is not reactive but is deprotonated in the presence of a base-forming anion. Pyrazoles can be selectively lithiated at different carbons and subsequently react with electrophiles depending on the substitution patterns.Formula: C9H9N3
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics