The internalenergy distribution P(Eint) of ions emitted in an electrospray (ESI) source interfaced with a sector massspectrometer is evaluated by using the experimental survival yield (SY) method including the kinetic shift. This method is based on the relationship between the degree of fragmentation of an ion and its amount of internalenergy and uses benzylpyridinium cations due to their simple
Solvent reorganisation as the driving force for rate changes of Menschutkin reactions in an ionic liquid
作者:Hon Man Yau、Andrew G. Howe、James M. Hook、Anna K. Croft、Jason B. Harper
DOI:10.1039/b909171h
日期:——
The effect on the rate of reaction of each of a series of Menschutkin processes on changing from a molecular solvent to an ionic liquid was investigated. In each case, the rate acceleration observed at room temperature could be attributed to the change in the entropy of the system on reaching the transition state, offsetting any enthalpic cost.
Shpan'ko, I. V.; Korostylev, A. P.; Rusu, L. N., Journal of Organic Chemistry USSR (English Translation), 1984, vol. 20, p. 1715 - 1723
作者:Shpan'ko, I. V.、Korostylev, A. P.、Rusu, L. N.
DOI:——
日期:——
‘One-pot’ Hammett plots: a general method for the rapid acquisition of relative rate data
作者:Hon Man Yau、Anna K. Croft、Jason B. Harper
DOI:10.1039/c2cc34074g
日期:——
A general âone-potâ method for determining relative rates of reaction in complex mixtures has been established using free energy relationships to demonstrate its utility. Competition experiments involving as many as seven species gave relative rate constants that are in good agreement to those obtained from individual kinetic analyses.
Photocatalyst-controlled and visible light-enabled selective oxidation of pyridinium salts
作者:Xiang-Jun Peng、Hai-Ping He、Qian Liu、Kun She、Bao-Qi Zhang、Heng-Shan Wang、Hai-Tao Tang、Ying-Ming Pan
DOI:10.1007/s11426-020-9958-6
日期:2021.5
methods of photocatalytic-controlled and visible light-induced selective oxidation of pyridiniums with air as the terminal oxidant. The key to these transformations is to choose the appropriate light source and photocatalyst. Pyridiniums are successfully converted into pyrroles through oxygen-mediated cycloaddition, proton-coupled electron transfer (PCET), pyridine ring opening, and recyclization. The