METHOD FOR PRODUCING SUBSTITUTED FLUORINE-CONTAINING OLEFIN
申请人:Nagai Takabumi
公开号:US20120330072A1
公开(公告)日:2012-12-27
This invention relates to a method of reacting fluoroolefin with an organic magnesium compound in the presence of a catalyst comprising nickel or palladium so as to efficiently produce fluoroolefin, such as TFE, in which a fluorine (F) atom or atoms bonded to the sp
2
hybridized carbon atom are substituted with an organic group.
A self-consistent and cross-checked scale of spin-delocalization substituent constants, the .sigma.JJ.bul. scale
作者:Xikui Jiang、Guozhen Ji
DOI:10.1021/jo00048a048
日期:1992.10
On the basis of the F-19 NMR data of substituted alpha,beta,beta-trifluorostyrenes and the rate constants of their thermal cycloaddition reactions, a self-consistent and cross-checked scale of spin-delocalization substituent constants sigma(JJ). is proposed for 21 para-substituents and for 10 meta-substituents. By means of adopting different rho(mb) values, three methods for the calculation of the sigma(JJ). values at five different temperatures and their averaged values are presented. It has been shown that at each temperature and within a range of rho(mb) values from -0.20 to -0.40 the same set of sigma. constants are obtained from these three methods. There are seven advantages to the sigma(JJ). approach, including the fact that the reaction is exceptionally clean, a tailor-made polar parameter sigma(mb) is used in the dual-parameter equation, and the validity of the approach is strongly supported by the meta substituent effect which is independent of the polar effect. Some radical reactions, EPR data of substituted benzyl radicals, and bond dissociation energies are reexamined by using the sigma(JJ). in conjunction with polar sigma constants in dual-parameter equations.
US9067200B2
申请人:——
公开号:US9067200B2
公开(公告)日:2015-06-30
Palladium-Catalyzed Coupling Reactions of Tetrafluoroethylene with Arylzinc Compounds
Organofluorine compounds are widely used in all aspects of the chemical industry. Although tetrafluoroethylene (TFE) is an example of an economical bulk organofluorine feedstock, the use of TFE is mostly limited to the production of poly(tetrafluoroethylene) and copolymers with other alkenes. Furthermore, no catalytic transformation of TFE that involves carbon-fluorine bond activation has been reported