676-80-2Relevant articles and documents
Tunneling chemical reactions in solid parahydrogen: A case of CD3+H2→CD3H+H at 5 K
Momose, Takamasa,Hoshina, Hiromichi,Sogoshi, Norihito,Katsuki, Hiroyuki,Wakabayashi, Tomonari,Shida, Tadamasa
, p. 7334 - 7338 (1998)
Ultraviolet photolysis of CD3I in solid parahydrogen at 5 K gives CD3 radical, which decreases in a single exponential manner with a rate constant of (4.7±0.5)×10-6 s-1. Concomitantly, CD3H is formed, which is accounted for by the quantum tunneling reaction CD3+H2→CD3H+H. Under the same conditions. CH3I yields CH3 radical, but the corresponding reaction between CH3 and H2, expected to give CH4+H, does not proceed measurably at 5 K. The difference between the two systems is attributed to the difference in the zero point energy change.
Kinetics and Thermochemistry of the CH3, C2H5, and i-C3H7. Study of the Equilibrium R + HBr R-H + Br
Russell, John J.,Seetula, Jorma A.,Gutman, David
, p. 3092 - 3099 (1988)
The kinetics of the reactions between CH3, C2H5, and i-C3H7 with HBr were studied in a tubular reactor coupled to a photoionization mass spectrometer.Rate constants were measured as a functio of temperature to determine Arrhenius parameters.The following rate constant expressions were obtained (units of the preexponential factors are cm3 molecule-1 s-1 and those of the activation energies are kJ mol-1; the temperature range covered in each study is also indicated): CH3 + HBr ; C2H5 + HBr ; i-C3H7 + HBr .These results were combined with determinations of the reverse rate constants to obtain equilibrium constants for the reactions R + HBr R-H + Br.Second-law-based analyses yielded heats of formation and entropies of CH3, C2H5, and i-C3H7 that are in close agreement with recent determinations of heats of formation in prior investigations of dissociation-recombination equilibria and calculations of entropies.The observed negative activation energies for R + HBr reactions (and negative activation energies inferred for R + I2 reactions from the current results) provide the basis for a detailed explanation for the disparities that currently exist between heats of formation of alkyl radicals that have been obtained from studies of bromination and iodination kinetics and those that are derived from kinetic studies of other reactions.A complex mechanism for R + HBr reactions that is consistent with the observed kinetic behavior of these reactions is discussed.
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Pritchard et al.
, p. 849,854 (1956)
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Catalytic Activation of Unstrained, Nonactivated Ketones Mediated by Platinum(II): Multiple C-C Bond Cleavage and CO Extrusion
Sarju, Julia P.,Dey, Debashish,Torroba, Javier,Whitwood, Adrian C.,Redeker, Kelly,Bruce, Duncan W.
supporting information, p. 4539 - 4542 (2019/11/29)
The complexes [Pt(tolpy)Cl(L)] (tolpy = 2-(4-tolyl)pyridyl; L = dmso, dms, py, PPh3, CO) are precursors for the catalytic cleavage of C-C bonds and extrusion of CO from a series of unactivated ketones such as cyclohexanone; deuterium labeling experiments demonstrate the involvement of a transfer hydrogen step in the mechanism.
Accessing the Nitromethane (CH3NO2) Potential Energy Surface in Methanol (CH3OH)-Nitrogen Monoxide (NO) Ices Exposed to Ionizing Radiation: An FTIR and PI-ReTOF-MS Investigation
Góbi, Sándor,Crandall, Parker B.,Maksyutenko, Pavlo,F?rstel, Marko,Kaiser, Ralf I.
, p. 2329 - 2343 (2018/03/21)
(D3-)Methanol-nitrogen monoxide (CH3OH/CD3OH-NO) ices were exposed to ionizing radiation to facilitate the eventual determination of the CH3NO2 potential energy surface (PES) in the condensed phase. R
