摘要:
A process for the preparation of a compound of Formula A:
wherein
X¹ and X² are independently selected from H or any substituent which does not interfere with the electrochemical reductive fluorination; and Z¹ and Z² are each independently selected from H or an electron donating group; which comprises electrochemical reductive fluorination of a compound of Formula B:
wherein X¹, X², Z¹ and Z² are as defined above in a mixture of anhydrous hydrogen fluoride and an alkali metal fluoride. The 4-fluoroanilines find use as intermediates in the manufacture of a wide range of agrochemicals, dyestuffs and pharmaceuticals.
摘要:
A fluorinated graphite having the formula (C x F) n wherein x is a numerical value of about 2.0 to about 5.5 and n refers to an indefinite number of the recurring (C x F) unit and having a crystalline structure exhibiting a peak at about 13.7° to about 15.0° in terms of an angle of 26 corresponding to the diffraction at the (001) plane in the X-ray diffraction pattern, a peak in the vicinity of 685.3 eV due to the F 1S and two peaks in the vicinity of 287.5 eV and 284.3 eV due to the C 1S in the spectrum of electron spectroscopy of chemical analysis, two peaks in the vicinity of 1100 cm- 1 and 1240 cm -1 in the IR spectrum, and an electric conductivity of at least about 10- 8 Ω -1 cm -1 , and being thermally stable in air up to 200°C from the viewpoint concerning a pattern of X-ray diffraction; a process for producing the fluorinated graphite thereof which comprises subjecting a carbon material to electrolysis in hydrogen fluoride at a voltage of about 6.5 V to about 15 V at a temperature of about -40°C to about 100°C in the presence of an electrically conductive agent; and an electric cell comprising a negative electrode using a light metal as an active material, an electrolyte and a positive electrode using, as an active material, the fluorinated graphite. The fluorinated graphite has a wide variety of uses, for example, besides as an active material for the positive electrode of an electric cell as above, lubricants, stain-resistant and water and/or oil repellent materials, etc. The electric cell as above is advantageously used in devices requiring a high voltage such as a watch, a clock, a small radio, a small computer, etc.
摘要:
Described is a process for the electrochemical fluorination of a substrate, the process comprising the steps of: providing a substrate comprising at least one carbon-bonded hydrogen; preparing a reaction solution comprising the substrate and hydrogen fluoride; passing electric current through the reaction solution sufficient to cause replacement of one or more hydrogens of the substrate with fluorine, the electric current being interrupted through a current cycle defined by current levels comprising an elevated current and a reduced current; wherein the current varies in such a manner that the resistance of the cell operated with interrupted current is lower than the resistance of the cell operated with uninterrupted current.