Gas phase fluorination

Gas phase fluorination of methane or ethane and their derivatives by fluorine. 

Hirano, T., Nonoyama, S., Miyajima, T., el al. (1986) Gas-phase fluorine-19 and proton high-resolution NMR spectroscopy application to the study of unperturbed conformational energies of 1,2-difluoroethane. J. Chem. Soc., Chem. Commun., 606-607. 

OPCM - organic polymerized complex method SCH - solid crystalline hydrates WS - water solutions Me CA - metal citric acid ratio GpF-gas-phase fluorination ZrOz - cubic phase, Zr02 - monoclinic phase, Zr02 - tetragonal phase - trace of cubic phase. 

CH2CI2/HF CH2F2 AIF3 on a Cr-Ni Catalytic gas phase fluorination 16... 

The process of gas-phase fluorine doping reduces hydroxyl level in the xerogels by the attack of gel network and the reaction takes place ... 

Gas-phase fluorination of hydrocarbon heterocycles using C0F3 as fluorinating agent was successfully apphed for the preparation of some perfluorinated heterocychc compounds" (see Fig. 9.9). 

The gas-phase fluorination of substituted pyrimidine 117 (Rf = CF(CF3)2) over C0F3 leads to the selective and high-yield formation of azadiene 118, however, unsubstituted F-pyrimidine under similar conditions forms the dimer 119. On the other hand, the reaction of isomeric F-pyridazine with C0F3 is straightforward leading to azadiene 120 (Fig. 9.36). Detailed discussion on the radical cation mechanism... 

Treatment of pentachloropyridine with hydrogen fluoride at 180 °C under pressure gives a mixture of trichloro-2,6-difluoro- and dichIoro-2,4,6-tri-fluoro-pyridine. Gas-phase fluorination of pentachloropyridine and of 2,4, 2,4,6-trichlorop3rrimidine with hydrogen fluoride over chromium oxide-fluoride and aluminium oxide-fluoride (or A1203) has also been achieved tetrachloropyrimidine gives 5-chloro-2,4,6-trifluoro- (61%), 5,6-dichloro-2,4-difluoro- (33 %), and 4,5,6-trichloro-2-fluoro-pyrimidine (6 %). ... 

Gough, K.M. and Henry, B.R. (1984) Overtone spectral investigation of substituent-induced bond-length changes in gas-phase fluorinated benzenes and their correlation with ab initio STO-3G and 4-21G calculations. /. Am. Chem. 

Guo, Xinzheng Zhao, Xuan Zheng, Chengwu. Preparation of 1,1,1-trifluoroethane by gas-phase fluorination of 1,1,1-dichlorofluoroethane. CN 1106780 A 19950816 (1995). 

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