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. Electric Literature of 499-40-1Electric Literature 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.
Dichromates of 2,4′-bipyridine (two forms), [(H2-2,4′-bipy)(Cr2O7)] (1) and [(H-2,4′-bipy)2(Cr2O7)] (2), 2,2′-dipyridylamine, [(H-dpam)2(Cr2O7)](3), and 4,4′-bipyridine (two forms), [(H2-4,4′-bipy)(Cr2O7)] (4) and [ (H-4,4′-bipy)2(H2-4,4′-bipy)(Cr2O7)2] (5), were prepared by reaction of chromium(VI) oxide with the free organic bases in the appropriate stoichiometric ratio in water at 25°C. The structures of compounds 2, 3and 4 were determined by X-ray crystallography and revealed the existen ce of discrete dichromate anions formed by two tetrahedral CrO4 groups joined through shared O atoms, and the respective protonated organic bases hydrogen bonded to respective dinegative anions. A short C-H…O interaction [2.996(4) A] between the organic cation and the dichromate anion was observed in compound 4. All organic dichromates were also characterized by IR, UV-vis (1)H NMR measurements. For compounds 2, 3 and 4. acomparison was made and the crystallographic data of a series of mono- and polychromates and showed a correlation of the terminal and bridging Cr-O atomic distances with an increasing degree of polymerization. A gra ph theory cluster expansion was employed for these correlation studies.
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 499-40-1 is helpful to your research., Electric Literature of 499-40-1
Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics