Synthesis of perfluoroalkyl trifluoromethanesulfonates from perfluoroalkyl halides. Substitutive electrophilic dehalogenation with chlorine(I) and bromine(I) trifluoromethanesulfonates
An efficient palladium‐catalyzed Heck‐type reaction of fluoroalkyl halides, including perfluoroalkyl bromides, trifluoromethyl iodides, and difluoroalkyl bromides, has been developed. The reaction proceeds under mild reaction conditions with high efficiency and broad substrate scope, and provides a general and straightforward access to fluoroalkylated alkenes which are of interest in life and material
Unexpected reactivity of cyclic perfluorinated iodanes with electrophiles
作者:Stefan Gruber、Simon M. Ametamey、Roger Schibli
DOI:10.1039/c8cc04558e
日期:——
We have found that cyclic perfluorinated iodanes react with electrophiles (E+ = Br, Cl, F, I) to afford perfluorinated E–RF compounds. This reactivity is unexpected since cyclic perfluorinated iodanes are considered as electrophilic reagents that normally react with nucleophiles (e.g. Nu− = SR, OR) to afford Nu–RF products. The utility of this new transformation is demonstrated for a [18F]CF3CF2-containing
Addition of some unreactive fluoroalkanes to tetrafluoroethylene.
作者:Viacheslav A. Petrov、Carl G. Krespan
DOI:10.1016/s0022-1139(99)00279-1
日期:2000.3
of the reactions, especially the presence of low percentages of perfluoroisopropyl iodide and bromide in the products, are accounted for by proposed mechanisms involving halonium intermediates. Longer-chain primary iodides can also be added to tetrafluoroethylene, but the final products are predominantly fluoroolefins, with pentafluoroethyl iodide as a byproduct. In the case of the addition of C2F5I
三氟甲烷CF 3 X(X = H,Cl,Br,I)与四氟乙烯的缩合反应形成相应的F - n-丙基加合物,已使用氯氟化铝作为催化剂。C 3 F 7 I和C 3 F 7的产率Br特别好,使得这些有用的全氟丙基中间体容易获得。反应的细节,特别是产物中低百分比的全氟异丙基碘化物和溴化物的存在,是由涉及ha中间体的拟议机理引起的。也可以将长链伯碘化物添加到四氟乙烯中,但最终产物主要是氟代烯烃,副产物是五氟乙基碘化物。在C的添加的情况下,2 ˚F 5我四氟乙烯,对于terafluoroethylene的高效,低温二聚条件˚F丁烯-2的下的催化组合2 ˚F 5已经定义了I /氯氟化铝。提出了I +从F-丁烯2的碘鎓衍生物异常转移到四氟乙烯的证据。
Bromination of fluoroalkanes. Part 5.—Kinetics of forward and reverse reactions in the system Br2+ i-C3F7H⇌HBr + i-C3F7Br
作者:Brian S. Evans、Ian Weeks、Eric Whittle
DOI:10.1039/f19837901471
日期:——
The kinetics of the forward and reversereactions in the gas-phase system Br2+ i-C3F7H⇌HBr + i-C3F7Br have been studied. The slow steps for the forward and reversereactions, respectively, are Br + i-C3F7H→HBr + i-C3F7(2), Br + i-C3F7Br→Br2+ i-C3F7. (–3)
在气相系统BR中的正向和反向反应的动力学2 + IC 3 ˚F 7 H⇌HBr+ IC 3 ˚F 7溴进行了研究。正向和反向反应的缓慢步骤分别为Br + iC 3 F 7 H→HBr + iC 3 F 7(2),Br + iC 3 F 7 Br→Br 2 + iC 3 F 7。(–3)