Ram, B.; Roy, J.; Sarkar, A., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1988, vol. 27, # 1-12, p. 665
作者:Ram, B.、Roy, J.、Sarkar, A.
DOI:——
日期:——
Gas-Phase Reactions of Catecholate and Related Anions with BF3 and SiF4
作者:W. S. Taylor、Lucia M. Babcock
DOI:10.1021/ja00129a012
日期:1995.6
The gas-phase reactions of the anions of catechol, 4-methylcatechol, resorcinol, and o-cresol with BS and SiF4 have been examined using the flowing afterglow technique. These systems initially form an addition product in a three-body step, and this addition product subsequently participates in fluoride transfer with a second molecule of the reactant neutral. The reactions involving the anions of catechol and 3-methylcatechol exhibit a second primary product channel which is independent of the concentration of the third-body. Results suggest that this bimolecular product is a cyclic species formed in a step involving the ring-closure step and loss of HF. Relative amounts of the two primary products are sensitive to pressure as well as to the identity of the Lewis acid. We explain this behavior in terms of a multiple-well potential energy surface which contains a barrier in the bimolecular product channel.
Substituent effects on rates of one-electron oxidation of phenols by the radicals chlorine dioxide, nitrogen dioxide, and trioxosulfate(1-)
作者:Zeev B. Alfassi、Robert E. Huie、P. Neta
DOI:10.1021/j100408a063
日期:1986.8
Reduction Potentials and Kinetics of Electron Transfer Reactions of Phenylthiyl Radicals: Comparisons with Phenoxyl Radicals
作者:D. A. Armstrong、Qun Sun、R. H. Schuler
DOI:10.1021/jp960165n
日期:1996.1.1
The reductionpotentials relative to the standard hydrogen electrode (SHE) for a number of para-substituted phenylthiyl radicals (E°(p-XC6H4S•/p-XC6H4S-)) have been derived from pulse radiolytic studies of electron transfer equilibria which compare their values to those of radicals of known reductionpotentials. A ladder combining the reductionpotentials for both phenylthiyl and phenoxylradicals has
相对于为多个对位取代phenylthiyl自由基(标准氢电极(SHE)还原电位ë °(p -XC 6 ħ 4小号• / p -XC 6 ħ 4小号- ))已经被从脉冲辐解衍生研究电子转移平衡,将其值与已知还原电位的自由基的值进行比较。建立了结合了苯基硫基和苯氧基自由基还原电位的阶梯。这些还原电位已被证明是自洽的,并且介于p的还原电位之间-苯并半醌基阴离子为0.02 V,苯氧基为0.79V。还原电位随着对位取代基的给电子力的增加而降低。然而,对苯硫基自由基的取代作用比对它们的氧类似物的作用要弱得多。这些观察结果表明,硫原子与芳环系统之间的电子相互作用远小于氧原子所发生的电子相互作用。用马库斯理论检验电子传输速率表明,p -XC 6 H 4 O •和p -XC 6 H 4 S •的重组能自由基同样受H,CH 3和CH 3 O取代的影响。然而,重组能大幅提高用于h 2 N和O -位取代基具有其效果是为要少得多p