A catalyst don`t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. Synthetic Route of 499-40-1Synthetic Route of 499-40-1, , Name is (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal, molecular formula is C12H22O11. In a patent, introducing its new discovery.
In the title complexes, [Pd(C10H6O 2)(C10H9N3)]·H2O, (I), and [Pd(C11H6O3)(C10H 9N3)], (II), the PdII centers have a distorted cis-square-planar geometry. In (I), the PdII atom is coordinated to two N atoms of the di-2-pyridylamine (DPA) ligand and two O atoms of the naphthalene-2,3-diolate (ND) dianion. In (II), the PdII atom is coordinated to two N atoms of the DPA ligand, one carboxylate O atom and one oxide O atom from the 3-oxidonaphthalene-2-carboxylate (NC) ligand. The dihedral angle between the planes of the two pyridine rings of DPA in (I) is 16.20 (12) and that in (II) is 29.45 (10). In (I), the molecules are linked by N-H…O and O-H…O hydrogen bonds to generate centrosymmetric dimers. In (II), molecules are linked by N-H…O and C-H…O hydrogen bonds to generate spirals.
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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics