Synthesis of Chiral α-CF<sub>3</sub>-Substituted Benzhydryls via Cross-Coupling Reaction of Aryltitanates
作者:Andrii Varenikov、Evgeny Shapiro、Mark Gandelman
DOI:10.1021/acs.orglett.0c03673
日期:2020.12.4
We describe a highly efficient approach toward α-CF3-substituted benzhydryls thanks to the employment of organotitanium(IV) based nucleophiles. The use of commercially available anesthetic halothane as a cheap fluorinated building block in a sequential one-pot nickel-catalyzed enantioselective cross-coupling reaction of aryl titanates allowed for the synthesis of chiral α-CF3-substituted benzhydryls
Mixed-Metal MIL-100(Sc,M) (M=Al, Cr, Fe) for Lewis Acid Catalysis and Tandem CC Bond Formation and Alcohol Oxidation
作者:Laura Mitchell、Patrick Williamson、Barbora Ehrlichová、Amanda E. Anderson、Valerie R. Seymour、Sharon E. Ashbrook、Nadia Acerbi、Luke M. Daniels、Richard I. Walton、Matthew L. Clarke、Paul A. Wright
DOI:10.1002/chem.201404377
日期:2014.12.15
obtained and filtered off after extended reaction times. Supported α‐Fe2O3 nanoparticles were also active Lewisacid species, although less active than Sc3+ in trimer sites. The incorporation of Fe3+ into MIL‐100(Sc) imparts activity for oxidationcatalysis and tandem catalytic processes (Lewisacid+oxidation) that make use of both catalytically active framework Sc3+ and Fe3+. A procedure for using these mixed‐metal
Quantitative trifluoromethylation of carbonyl-containing lignin model compounds
作者:B.C. Ahvazi、D.S. Argyropoulos
DOI:10.1016/0022-1139(96)03431-8
日期:1996.6
lignin model compounds was made possible by using Ruppert' s reagent in the presence of tetramethylammonium fluoride (TMAF), followed by hydrolysis with aqueous HF. These studies demonstrate that such a method can quantitatively convert carbonylgroups to the CF3-containing compounds, thus qualifying the procedure as a potential analytical tool for the determination of carbonylgroups in lignins.
Magnesium Metal-Mediated Reductive Trifluoromethylation of Aldehydes with Phenyl Trifluoromethyl Sulfone
作者:Jinbo Hu、Yanchuan Zhao、Jieming Zhu、Chuanfa Ni
DOI:10.1055/s-0029-1218752
日期:2010.6
An unprecedented reductive nucleophilic trifluoromethylation of aldehydes by using phenyl trifluoromethyl sulfone is reported. Mercury(II) chloride efficientlyactivates magnesium metal to induce the desulfonylative trifluoromethylation process. The new reductive trifluoromethylation provides an alternative method for efficienttrifluoromethylation of non-enolizable or enolizable aldehydes with readily
The invention concerns a method for preparing &agr;-halogenated ketones from secondary &agr;-halogenated alcohols. More particularly, the invention concerns the preparation of &agr;-trihalogenated ketones from secondary &agr;-trihalogenated alcohols. The method for preparing said &agr;-halogenated ketone is characterized in that it consists in oxidizing in liquid phase, a secondary &agr;-halogenated alcohol, using molecular oxygen or a gas containing same, in the presence of a catalyst based on a metal M
1
selected among metals of group 1b and 8 of the periodic system of elements and optionally an activating element.