作者:Peter A. Byrne、Shinjiro Kobayashi、Ernst-Ulrich Würthwein、Johannes Ammer、Herbert Mayr
DOI:10.1021/jacs.6b10889
日期:2017.2.1
slowly with trifluoroethanol than the parent benzhydrylium ion (Ph)2CH+, even though in solvolysis reactions (80% aqueous ethanol at 25 °C) the vinyl bromides leading to 2 and 3 ionize much more slowly (half-lives 1.15 yrs and 33 days) than (Ph)2CH-Br (half-life 23 s). The origin of this counterintuitive phenomenon was investigated by high-level MO calculations. We report that vinyl cations are not
Aryl Boronic Acid Catalysed Dehydrative Substitution of Benzylic Alcohols for C−O Bond Formation
作者:Susana Estopiñá‐Durán、Liam J. Donnelly、Euan B. Mclean、Bryony M. Hockin、Alexandra M. Z. Slawin、James E. Taylor
DOI:10.1002/chem.201806057
日期:2019.3.12
substitution of benzylicalcohols with a second alcohol to form new C−Obonds. This method has been applied to the intermolecular substitution of benzylicalcohols to form symmetrical ethers, intramolecular cyclisations of diols to form aryl‐substituted tetrahydrofuran and tetrahydropyran derivatives, and intermolecular crossed‐etherification reactions between two different alcohols. Mechanistic control
A novel borontrifluoride⋅diethyl ether (BF3⋅OEt2)-catalyzed etherification procedure has been developed in which primary and secondary alcohols are easily converted into diphenylmethyl ethers with yields of up to 99%.
Proton or Carbene Transfer? On the Dark and Light Reaction of Diazoalkanes with Alcohols
作者:Claire Empel、Chao Pei、Feifei He、Sripati Jana、Rene M. Koenigs
DOI:10.1002/chem.202104397
日期:2022.3.10
O-H Functionalization: In this combined experimental and computational study, the reaction of diaryl diazoalkanes with alcohols is reported. In the ground state, a direct proton transfer governs reactivity with acidic HFIP. On the contrary, photoexcitation leads to formation of a triplet carbene intermediate that undergoes an alcohol-assisted intersystem crossing to a solvent-stabilized carbene that
Expedient and efficient one pot synthesis of trifluoroethyl ethers from metal free 2,4,6-tris-(2,2,2-trifluoro-ethoxy)-[1,3,5] triazene
作者:Shrawan Kumar Mangawa、Chiranjeev Sharma、Ashawani kumar Singh、Satish K. Awasthi
DOI:10.1039/c5ra00618j
日期:——
An efficient synthesis of fluorinated alkyl and aryl ethers was achieved by the use of s-triazene derived fluorinated reagent 2,4,6-tris-(2,2,2-trifluoro-ethoxy)-[1,3,5] triazene (TriTFET).