Synthesis, characterization and use of imidazole and methyl-pyrazole based pyridine ligands as extractants for nickel(II) and copper(II)

Taking a deeper look into the roles of amines in atomic absorption spectrometry

“…21 Imidazole is a signicant s donor, with a smaller cone angle and less stereochemical crowding, and is quite suitable for developing separating agents for the later 3d transition metal ions. 22 Derivatives of imidazole, such as octyl-or decyl-imidazole, are also suitable extractants for transition d block metals, Co (II) , Cu (II) , Ni (II) , and Zn (II) , at pH above 2.0. 19,23 Benzimidazole shows a proton affinity intermediate between imidazole and pyridine, having an enhanced p-back bonding capability due to a second benzene ring.…”

One-Pot Synthetic Approach to 3-Carboxyl- and 3-Ketopyridines in Aqueous Media

“…The pyridine ring is one of the most abundant heteroaromatic structures and is an essential building block that is embedded as a core structural motif in numerous natural products, agrochemicals, and pharmaceutical drugs (Scheme ). Therefore, the synthesis of substituted pyridines has been actively pursued to date. To access diverse substitution patterns, many affective and regioselective syntheses using simple substrates have been established, most of which are based upon condensation reactions of carbonyl compounds, cycloaddition reactions, organocatalytic reactions, or via miscellaneous procedures, such as ring expansion or the intramolecular cyclization process of specific pre-synthesized starting materials (Figure S1).…”