Recommanded Product: 1H-Pyrazole-5-carbaldehyde. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 1H-Pyrazole-5-carbaldehyde, is researched, Molecular C4H4N2O, CAS is 948552-36-1, about Unprecedented copper(II)-assisted acetal formation of a formyl-substituted bispyrazole. The x-ray structures of copper[1,2-bis(3′-dimethoxymethylpyrazol-1′-yl)ethane] dichloride and dibromide. Author is Koval, Iryna A.; Schuitema, Anna M.; Driessen, Willem L.; Reedijk, Jan.
The formation of two new acetal-containing ligands 1,2-bis(3′-dimethoxymethylpyrazol-1′-yl)ethane (bdmpe) and 1,2-bis(3′-diethoxymethylpyrazol-1′-yl)ethane (bdepe) in a Cu(II)-assisted alcoholysis of the initial ligand 1,2-bis(3′-formylpyrazol-1′-yl)ethane is described. The new ligands form polymeric complexes with Cu(II) salts, [Cu(L)X2]x, where L = bdmpe or bdepe, and X = Cl or Br. The single-crystal x-ray structures of [Cu(bdmpe)Cl2]x and [Cu(bdmpe)Br2]x show that two of the four oxygen atoms of the acetal fragments are axially semi-coordinated to the copper(II) ions, adjusting the coordination sphere around the metal ion to a very distorted octahedron. The coordination of the oxygen atoms of the acetal groups to the metal ion may well be the driving force for the transformation of the initial aldehyde groups into the acetal fragments. The equatorial plane in [Cu(bdmpe)Cl2]x is a trans-CuN2Cl2 chromophore, while in [Cu(bdmpe)Br2]x it is a cis-CuN2Br2 species with a large in-plane distortion.
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