Thermodynamic, spectroscopic, and density functional theory studies of allyl aryl and prop-1-enyl aryl ethers. Part 1. Thermodynamic data of isomerization
An efficient approach towards syntheses of ethers and esters using CsF–Celite as a solid base
作者:Syed Tasadaque A Shah、Khalid M Khan、Angelica M Heinrich、M.Iqbal Choudhary、W Voelter
DOI:10.1016/s0040-4039(02)02060-9
日期:2002.11
The coupling reactions of a number of alcohols and phenols with alkyl, acyl or benzoyl halides in acetonitrile with cesium fluoride–Celite are described. It has been found that CsF–Celite combinations provide an efficient, convenient and practical method for syntheses of both, ethers and esters.
Cesium fluoride-Celite: a solid base for efficient syntheses of aromatic esters and ethers
作者:Syed Tasadaque Ali Shah、Khalid Mohammed Khan、Hidayat Hussain、Muhammad Usman Anwar、Miriam Fecker、Wolfgang Voelter
DOI:10.1016/j.tet.2005.03.126
日期:2005.7
Coupling reactions of a number of aromatic and heteroaromatic phenols with alkyl, acyl or benzoyl halides in acetonitrile with cesium fluoride-Celite are described, demonstrating that this reagent provides an efficient, convenient and practical method for the syntheses of aromaticesters and ethers.
[Structure: see text] HighlyenantioselectiveFriedel-Craftsalkylation of simple and aromatic ethers (4a-l) with 3,3,3-trifluoropyruvate (3) was accomplished by using chiral (4R,5S)-DiPh-BOX(1b)-Cu(OTf)2 complex (1 mol %) as a catalyst under solvent-free conditions. Excellent yields and enantioselectivities (90-93% ee, after recrystallization up to 99% ee) of the Friedel-Craftsalkylation products were obtained
Formation of dibenzofurans by flash vacuum pyrolysis of aryl 2-(allyloxy)benzoates and related reactions
作者:Michael Black、J. I. G. Cadogan、Hamish McNab
DOI:10.1039/c002480e
日期:——
Flashvacuumpyrolysis (FVP) of aryl 2-(allyloxy)benzoates 5 and of the corresponding aryl 2-(allylthio)benzoates 6 at 650 °C, gives dibenzofurans 19 and dibenzothiophenes 20, respectively. The mechanism involves generation of phenoxyl (or thiophenoxyl) radicals by homolysis of the O-allyl (or S-allyl) bond, followed by ipso attack at the ester group, loss of CO2 and cyclisation of the resulting aryl
Enantioselective Construction of Si‐Stereogenic Center via Rhodium‐Catalyzed Intermolecular Hydrosilylation of Alkene
作者:Tao He、Li‐Chuan Liu、Wen‐Peng Ma、Bin Li、Qing‐Wei Zhang、Wei He
DOI:10.1002/chem.202003506
日期:2020.12.18
Catalytic, enantioselective synthesis of stereogenic silicon compounds remains a challenge. Herein, we report a rhodium‐catalyzedregio‐ and enantio‐selective intermolecularhydrosilylation of alkene with prochiral dihydrosilane. This new method features a simple catalytic system, mild reaction conditions and a wide functional group tolerance.