In an article, author is Yamaguchi, Isao, once mentioned the application of 90965-06-3, Recommanded Product: Dimethyl (1-diazo-2-oxopropyl)phosphonate, Name is Dimethyl (1-diazo-2-oxopropyl)phosphonate, molecular formula is C5H9N2O4P, molecular weight is 192.1097, MDL number is MFCD07368360, category is chiral-nitrogen-ligands. Now introduce a scientific discovery about this category.
Eco-friendly synthesis of ionic helical polymers and their chemical properties and reactivity
Reaction of N-(2,4-dinitrophenyl)pyridinium chloride (salt(Cl-)) with sodium dicyanamide (Na(CN)(2)N) resulted in anion exchange between Cl- and (CN)(2)N- to yield a new Zincke salt, salt((CN)(2)N-). Reactions of salt((CN)(2)N-) with piperazine, specifically (R)-(-)- or (S)-(+)-2-methylpiperazine under eco-friendly conditions, such as in aqueous solution, in the absence of a catalyst, and at room temperature, resulted in pyridinium ring opening to yield ionic high-molecular-weight polymers with 5-2,4-dienylideneammonium dicyanamide units or chiral 5-(2-methylpiperazinium)-2,4-dienylideneammonium dicyanamide units, namely, polymer(H;(CN)(2)N-), polymer(R-Me;(CN)(2)N-), and polymer(S-Me;(CN)(2)N-). UV-Vis measurements revealed that the -conjugation system expanded along the polymer chain due to the orbital interaction between the electrons on the two nitrogen atoms of the piperazinium ring. Circular dichroism (CD) measurements revealed a helical conformation of the main chain in polymer(R-Me;(CN)(2)N-) and polymer(S-Me;(CN)(2)N-). The reaction of polymer(H;(CN)(2)N-) with p-phenylenediamine (PDA) caused recyclization of the 2,4-dienylideneammonium unit and resulted in depolymerization to yield N-(4-aminophenyl)pyridinium dicyanamide. Cyclic voltammetry analysis suggested that the polymers obtained in this study undergo electrochemical oxidation and reduction.
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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
,Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis