Iodine-catalyzed disproportionation of aryl-substituted ethers under solvent-free reaction conditions
作者:Marjan Jereb、Dejan Vražič
DOI:10.1039/c3ob27267b
日期:——
iodine produced triphenylmethane and the corresponding aldehydes and ketones. The electron-donating substituents facilitated the reaction, while the electron-withdrawing groups retarded it; the difference in reactivity is not very high. Such an observation may be in favour of hydride transfer, predominantly from the less electron rich side of the ether with more stable carbocation formation. With the isotopic
Kinetics of hydride-transfer reactions from hydrosilanes to carbenium ions. Substituent effects in silicenium ions
作者:Herbert Mayr、Nils Basso、Gisela Hagen
DOI:10.1021/ja00034a044
日期:1992.4
varying substitution to para-substituted diarylcarbenium ions have been measured in dichloromethane solution. Generally the reactions follow a second-order rate law, -d[Ar 2 CH + ]/dt=k 2 [Ar 2 CH + ] [HSiR 1 R 2 R 3 ], and k 2 is independent of the degree of ion-pairing and the nature of the counterion (exceptions are reported). The reaction rates are almost independent of solvent polarity
已经在二氯甲烷溶液中测量了氢化物从具有广泛变化的取代基的氢硅烷 HSiR 1 R 2 R 3 到对位取代的二芳基碳鎓离子的转移速率。通常反应遵循二阶速率定律,-d[Ar 2 CH + ]/dt=k 2 [Ar 2 CH + ] [HSiR 1 R 2 R 3 ],k 2 与离子的程度无关-配对和反离子的性质(报告了例外情况)。反应速率几乎与溶剂极性无关