Hydrogen Fluoride Media Research Articles

Enhanced preparation of aryl and heteryl sulfur pentafluorides using mercury (II) oxide - hydrogen fluoride media as a fluorinating reagent

We developed enhanced method for low temperature and good yield preparation of aryl and heteryl sulfur pentafluorides from chlorotetrafluorides using mercury oxide - hydrogen fluoride and mercury oxide - pyridinium poly(hydrogen fluoride) media as the fluorinating reagents.

Preparative Electrosynthesis of Strong Oxidizers at Boron-Doped Diamond Electrode in Anhydrous HF.

The use of the boron-doped diamond electrode as a sufficiently stable electrode for electrochemical measurements/synthesis in liquid anhydrous hydrogen fluoride medium is reported. Electrooxidation of silver(I) has been studied in this solvent by using classical transient electrochemical methods and impedance spectroscopy. It has been found that faradaic currents related to silver(I) oxidation and the fluorine evolution reaction are reasonably separated at the potential scale, which allows efficient electrosynthesis of AgII F2 , a powerful oxidizer. Impedance spectroscopy measurements provide insight into complex mechanism of AgF2 formation. The procedure for electrosynthesis is provided for the first time in both galvanostatic and potentiostatic condition.

Cleavage path way and the product distribution pattern during the electrochemical perfluorination of tripropylamine

The electrochemical fluorination (ECF) of tripropylamine (TPA) was carried out in anhydrous hydrogen fluoride medium using a Simons type cell. Under optimum conditions, yield of perfluorinated product was about 51% and the selectivity of perfluorotripropylamine (PFTPA) was about 87%. Even in this process involving the well-known starting material, apart from PFTPA, about nine perfluorinated by-products were also identified. Perfluorinated products obtained were characterized by GC, 1 H and 19 F NMR spectra and were compared with reported values. The perfluorinated products obtained support the fission and formation of CC and CN bonds. The nature of the minor products formed also supports the involvement of cyclization and isomerization reactions during electrochemical fluorination. Suitable reaction schemes for the formation of different perfluorinated by-products were suggested based on the identified products obtained from ECF of TPA which clearly supports the free radical mechanistic pathway for this process.

New synthesis of fluorobenzene and derivatives

Fluorobenzene and derivatives 1 can be easily and selectively prepared by fluorodecarboxylation from the corresponding haloformates 2 in a hydrogen fluoride media under gaseous conditions over a mineral catalyst (1). ▪ A large number of compounds were prepared and most of the case, the yields are high (fluorobenzene; fluorotoluenes; 1,4 difluorobenzene; halofluorobenzenes). The reactivity of substrates over different catalysts will be discussed.

Disproportionation of bromine and iodine in hydrogen fluoride media

Disproportionation occurs when chlorine, bromine, or iodine are reacted with a hydrogen fluoride solution containing silver fluoride. In each case the reaction product is a halide which is tied up as the insoluble silver salt while the oxidation products are chlorine monofluoride, bromine trifluoride and iodine pentafluoride respectively.

Kinetic Study on Addition of Carbon Monoxide to Methallyl Chloride in Hydrogen Fluoride Medium under High Pressure

Kinetic Study on Addition of Carbon Monoxide to Methallyl Chloride in Hydrogen Fluoride Medium under High Pressure

Kinetic Study on the Addition Reaction of Carbon Monoxide with Ethyl Fluoride in Hydrogen Fluoride under High Pressures

The reaction of carbon monoxide with ethyl fluoride has been investigated in the anhydrous hydrogen fluoride medium under high pressures. The yield of propionic acid is fairly high and the rate of formation is of the first order with respect to carbon monoxide and one-half order to the mole ratio of charged hydrogen fluoride and ethyl fluoride. The overall activation energy has been found to be 6.9kcal/mole.