Kinetics and Mechanism of the Pyridinolysis of Phenacyl Bromides in Acetonitrile
作者:Han Joong Koh、Kwang Lae Han、Hai Whang Lee、Ikchoon Lee
DOI:10.1021/jo000411y
日期:2000.7.1
studies of the reactions of substituted phenacyl bromides (YC6H4COCH2Br) with pyridines (XC5H4N) are carried out in acetonitrile at 45.0 degrees C. A biphasic Bronsted plot is obtained with a change in slope from a large (betaX approximately equals 0.65-0.80) to a small (betaX approximately 0.36-0.40) value at pKa = 3.2-3.6, which can be attributed to a change in the rate-determiningstep from breakdown
Coupling of Azomethine Ylides with Nitrilium Derivatives of<i>closo</i>-Decaborate Clusters: A Synthetic and Theoretical Study
作者:Aleksey L. Mindich、Nadezhda A. Bokach、Maxim L. Kuznetsov、Matti Haukka、Andrey P. Zhdanov、Konstantin Yu. Zhizhin、Serguei A. Miltsov、Nikolay T. Kuznetsov、Vadim Yu. Kukushkin
DOI:10.1002/cplu.201200257
日期:2012.12
factors, and steric repulsion between the boron cluster and the azomethineylide molecule plays a crucial role. The activation of the nitrile group upon binding to the boron cluster is explained in terms of the electrostatic arguments. The mechanisms of the nucleophilic addition and the hypothetical cycloaddition between the azomethineylide and nitriles were investigated in detail.
Synthesis of 4-Methyl-6-N-(4-R-phenyl)-1-azabicyclo[3.2.1]octane-3-enes
作者:V. A. Shadrikova、A. A. Shumkova、V. A. Shiryaev、Yu. N. Klimochkin
DOI:10.1134/s1070428023080079
日期:2023.8
Abstract
1-Azabicyclo[3.2.1]oct-3-ene were synthesized by the intramolecular carbocationic cyclization of 1-[2-hydroxy-2-(4-R-phenyl)ethyl]-1,2,3,6-tetrahydropyridines in a trifluoromethanesulfonic acid medium