96258-62-7Relevant academic research and scientific papers
Facile Access to Fluoromethylated Arenes by Nickel-Catalyzed Cross-Coupling between Arylboronic Acids and Fluoromethyl Bromide
An, Lun,Xiao, Yu-Lan,Min, Qiao-Qiao,Zhang, Xingang
, p. 9079 - 9083 (2015)
The nickel-catalyzed fluoromethylation of arylboronic acids was achieved with the industrial raw material fluoromethyl bromide (CH2FBr) as the coupling partner. The reaction proceeded under mild reaction conditions with high efficiency; it features the use of a low-cost nickel catalyst, synthetic simplicity, and excellent functional-group compatibility, and provides facile access to fluoromethylated biologically relevant molecules. Preliminary mechanistic studies showed that a single-electron-transfer (SET) pathway is involved in the catalytic cycle.
Monofluoroalkyl-containing compound and its preparation method and use
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Paragraph 0076; 0077; 0078, (2017/07/31)
The invention discloses a monofluoroalkyl-containing compound and its preparation method. The preparation method comprises that in a solvent, in the presence of an alkali, an additive, a ligand and a catalyst, a compound A and a compound B undergo a suzuk
Palladium-Catalyzed Monofluoromethylation of Arylboronic Esters with Fluoromethyl Iodide
Hu, Jingyu,Gao, Bing,Li, Lingchun,Ni, Chuanfa,Hu, Jinbo
, p. 3086 - 3089 (2015/06/30)
The first palladium-catalyzed direct monofluoromethylation of arylboronic esters to produce monofluoromethyl arenes is reported. The reaction is typically carried out at room temperature within 4 h and has a good functional group tolerance. The monofluoromethylating agent, CH2FI, was readily prepared via a halogen-exchange process.
Stabilization Demands of Diethyl Phosphonate Substituted Carbocations as Revealed by Substituent Effects
Creary, Xavier,Underiner, Ted L.
, p. 2165 - 2170 (2007/10/02)
Trifluoroethanolyses of a series of mesylate derivatives of diethyl (1-aryl-1-hydroxymethyl)phosphonates, 9, gave a Hammett ρ value of -10.1 in the electron donor substituent region.This value was slightly less than the value of -11.6 seen in the corresponding benzyl mesylates, ArCH2OMs, 12, in hexafluoroisopropyl alcohol.These data suggest that the demand for aryl group stabilization in the intermediate phosphoryl-substituted cation 10 does not surpass that of the α-H analogues, the benzyl cations.Some other factor must therefore account for the relative ease of formation of cations 10, which have the electronegative diethyl phosphonate group attached directly to the cationic center.The likely factor is an offsetting cation stabilizing feature associated with the diethyl phosphonate group.The Hammett plots for both mesylates 9 and 12 show a break, with decreased ρ values (-6.1 and -5.1, respectively) being observed in the electron-withdrawing region of the plot.Solvent effect studies on 9-m-F suggested that a change to "borderline behavior" is the origin of the break in the Hammett plot.A mechanistic change to the kδ process could be ruled out.The triflate derivative of diethyl (1-hydroxyethyl)phosphonate, 14, gave mixtures of substitution and elimination products on solvolysis.Solvent effect studies indicated a largely nucleophilic mechanism, while isotope effect studies were in line with some cationic character in the transition state in the highly ionizing, nonnucleophilic hexafluoroisopropyl alcohol solvent.Ion pair formation or the SN2 (intermediate) mechanism could rationalize the behavior of 14 in more highly ionizing solvents.
