A New Preparative Method for 1-Chloro-2,2,3-trifluoropropane (HCFC-253ca)
作者:Takashi Arimura、Shigeru Kurosawa、Akira Sekiya
DOI:10.1246/cl.1993.35
日期:1993.1
Allene was both fluorinated and chlorofluorinated with chlorinemonofluoride serving as a well-known chlorofluorinating and chlorinating reagent. 1-Chloro-2,2,3-trifluoropropane was obtained as a major product in the presence of cesium fluoride.
Hydrofluorocarbons (HFCs) have been fluorinated via the high-valency metal fluoridesCoF3, MnF3 and KCoF4. The fluorinating powers of these reagents for the monofluorinationof 2,2-difluoropropane are in the order CoF3 > MnF3 > KCoF4. The fluorinations of fluorinatedethanes with CoF3 have been examined in detail. The effects of temperature andthe distribution of products are described. Furthermore, regioselective
Synthesis, physical characterisation and chemical properties of methylsulphur trifluoride, CH3SF3
作者:Anthony J. Downs、Alan M. Forster、G. Sean McGrady、Ben J. Taylor
DOI:10.1039/dt9910000081
日期:——
Methylsulphur trifluoride, CH3SF3, has been synthesised by the reaction between AgF2 and a solution of CH3SCl in CCl3F. It is a clear, viscous liquid which attacks glass, is hydrolysed rapidly, and decomposes at ambient temperatures to give CH2FSF3 and CH2FSSCH2F. The compound has been characterised by its H-1 and F-19 NMR and vibrational spectra, and a partial vibrational assignment is proposed. The chemistry of CH3SF3 is akin to that of SF4. Thus, it functions as a fluoride ion donor much more readily than as a fluoride ion acceptor. It reacts with Pyrex glass to give CH3S(O)F, is hydrolysed to CH3S(O)OH, and effects O-F exchange with acetone to yield 2,2-difluoropropane.
The Chemistry of Sulfur Tetrafluoride. II. The Fluorination of Organic Carbonyl Compounds<sup>1</sup>