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 14098-44-3 is helpful to your research., Reference of 14098-44-3
Reference of 14098-44-3, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a Article，once mentioned of 14098-44-3
In contrast to trioxo(eta5-pentamethylcyclopentadienyl)rhenium(VII), (eta5-C5Me5)-ReO3, te organometallic oxide methyl(tripoxo)rhenium(VII), CH3ReO3 (1), reacts with bases, e.g., sodium hydroxide and organic amines, with expansion of the coordination sphere.Possible secondary reactions are dependent on the nature of the base.Reaction of 1 with sodium hydroxide in the presence of the crown ether benzo-15-crown-5 (B15C5) gives the perrhenate of the formula +– (3 in a fast and quantitative reaction, with concomitant liberation of methane; an intermediate of formula +– (2 seems plausible for this reaction. 3 exhibits a helical chain structure in the crystalline state, characterized by sodium cations in a nearly planar crown ether environment and tetrahedral perrhenate anions.These subunits are joined with each other, resulting in helical perrhenate anions.These subunits are joined with each other, resulting in helical perrhenate sodium chains of pentagonal bipyramidal configuration around sodium cations.The occurrence of the short-lived intermediate 2 is supported by the observed rapid oxygen exchange between 1 and 17O-labelled water.Methyl(trioxorhenium) (1) forms adducts with base ligands, thus expanding the coordination sphere of rhenium from 4 to 5 or 6.For example, quinuclidine (1-azabicyclo<2.2.2>octane) forms the 1/1 adduct 4a of trigonal bipyramidal structure, while 1,4-diazabicyclo<2.2.2>-octan (“dabco”) preferably gives the 2/1 adduct 4b.Primarily amines are also able to complex with the “metal acid”, as can be seen for the aniline complex 4c.The amine coordination entails reduced reactivity of 1, so base adducts of this type are excellent start in materials for the synthesis of derivatives of the title compound 1.Upon subsequent treatment with trimethylchlorosilane/triphenylphosphane and Grignard reagents, the complex 4d (formed from 1 and 2,2′-bipyridine) yields the novel class of compounds 6 of general formula (C10H8N2)ReR2(CH3)O (R = alkyl).The “base-stabilized” dichloro(methyl)(oxo)rhenium(V) is detected as an isolable reaction intermediate.A single crystal X-ray analysis of the derivative 6c (R = CH2Si(CH3)3) revealed an octahedral metal environment or this type of compounds.Ammonia forms the water-soluble complex CH3ReO3(NH3)2 (4e) upon reaction with 1.
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 14098-44-3 is helpful to your research., Reference of 14098-44-3
Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare