Merging Halogen-Atom Transfer (XAT) and Cobalt Catalysis to Override E2-Selectivity in the Elimination of Alkyl Halides: A Mild Route toward <i>contra</i>-Thermodynamic Olefins
作者:Huaibo Zhao、Alastair J. McMillan、Timothée Constantin、Rory C. Mykura、Fabio Juliá、Daniele Leonori
DOI:10.1021/jacs.1c06768
日期:2021.9.15
mechanistically distinct tactic to carry E2-type eliminations on alkyl halides. This strategy exploits the interplay of α-aminoalkyl radical-mediated halogen-atom transfer (XAT) with desaturative cobalt catalysis. The methodology is high-yielding, tolerates many functionalities, and was used to access industrially relevant materials. In contrast to thermal E2eliminations where unsymmetrical substrates give regioisomeric
Bromination of Norbornene: the Question of Bromonium Ions <i>vs</i>. 6,1-Hydride Shift
作者:D. R. Marshall、P. Reynolds-Warnhoff、E. W. Warnhoff、J. R. Robinson
DOI:10.1139/v71-148
日期:1971.3.15
a radical mechanism. The product composition from the bromine addition has been compared with that of the analogous chlorination and bromofluorination reactions. Degradation of the 2-exo,3-endo-dibromonorbornane from bromination of 5,6-14C-norbornene has shown that this dibromide is formed by two ionic routes: (a) from a bromonium ion 14 (or its equivalent), and (b) from the cation 12 formed by 6,1-hydride
The adamantane rearrangement ofsyn- andanti-Tricyclo[4.2.1.1.12,5] decane. Part II. Rearrangements initiated by regioselective formation of carbocations at C(3) and C(9)
作者:Marco Brossi、Camille Ganter
DOI:10.1002/hlca.19880710420
日期:1988.6.15
The endo- and exo-alcohols 5–12 of syn-(1) and anti-tricyclo[4.2.1. 12.5]decane (2) were treated with BF3/Et3SiH (ionic hydrogenation) in order to study the behaviour of the corresponding regioselectively generated carbocations at C(3) (a (syn), b (anti)) and C(9) (c (syn), d (anti)). The anti-hydrocarbon 2 is practically the sole product obtained starting with the four 3-alcohols (viaab from 5 and
Epoxidation and oxidative dihydroxylation of C10–C13 unsaturated bridged hydrocarbons involving hydrogen peroxide and modified forms of heteromolybdic compounds
作者:Kh. M. Alimardanov、O. A. Sadygov、N. I. Garibov、N. R. Dadashova、M. B. Almardanova、A. D. Kuliev
DOI:10.1134/s0965544117050024
日期:2017.5
Induced oxidation of C10–C13 tricyclic bridged olefins synthesized from C5–C8 cyclodiene hydrocarbons using hydrogenperoxide has been studied. It has been shown that phosphomolybdic heteropoly compounds supported on a finely divided carbon material and additionally modified with HBr and CoCO3 or Gd2O3 exhibit high activity in this reaction. Depending on the conditions of the experiments, the main
[EN] METATHESIS POLYMERIZATION METHODS<br/>[FR] PROCÉDÉS DE POLYMÉRISATION PAR MÉTATHÈSE
申请人:UNIV WASHINGTON
公开号:WO2016036976A1
公开(公告)日:2016-03-10
The present disclosure is directed to methods of making a polymer, including exposing a reaction mixture including a strained cyclic unsaturated monomer and an organic initiator to a stimulus to provide an activated organic initiator, whereby the activated organic initiator is effective to polymerize the strained cyclic unsaturated monomer via a 4-membered carbocyclic intermediate to provide a polymer having constitutional units derived from the strained cyclic unsaturated monomer.