Chloropolyfluoro-derivatives of ethyl methyl ether
作者:Paul L. Coe、Roger A. Rowbotham、John Colin Tatlow
DOI:10.1016/s0022-1139(96)03549-x
日期:1997.4
Fluorination of 2-chloroethyl methyl ether by potassium tetrafluorocobaltate at 180–250 °C gave various tri-, tetra-, penta- and hexafluoro(2-chloroethyl methyl) ethers. Cobalttrifluoride afforded the same products in poorer recoveries. Structures were established spectroscopically. Cl2-UV and CHClFCHFOCHF2 gave halogeno-ethers by exchange of Cl for both H and also F.
Diisopropylethylamine mono(hydrogen fluoride) for nucleophilic fluorination of sensitive substrates: synthesis of sevoflurane
作者:Linas V Kudzma、Chialang G Huang、Ralph A Lessor、Leonid A Rozov、Syeda Afrin、Florida Kallashi、Conor McCutcheon、Keith Ramig
DOI:10.1016/s0022-1139(01)00396-7
日期:2001.9
fluoride) (7), is shown to be an effective and selective nucleophilic fluorinating reagent when applied to halogen-exchange reactions of chloromethyl ethers, in particular the conversion of 1,1,1,3,3,3-hexafluoroisopropyl chloromethyl ether (3) to the volatile anesthetic sevoflurane (1,1,1,3,3,3-hexafluoroisopropyl fluoromethyl ether). The amine portion of the reagent does not react with the starting
A novel fluorination procedure of etheric substrates adsorbed on porous aluminium fluoride (PAF) using gaseous fluorine has been investigated. The reaction of ethyl 1,1,2,2-tetrafluoroethylether 1 and 2-chloro-1,1,2-trifluoroethylmethylether 9 with fluorine proceeds with upto 58% selectivity for α-monofluorinated 1 and 96% selectivity for α-monofluorinated 9. At the same time, charring can be avoided
Chiral interactions of the fluoroether anesthetics desflurane, isoflurane, enflurane, and analogues with modified cyclodextrins studied by capillary gas chromatography and nuclear magnetic resonance spectroscopy: A simple method for column-suitability screening
作者:Keith Ramig、Ashok Krishnaswami、Leonid A. Rozov
DOI:10.1016/0040-4020(95)00860-b
日期:1996.1
phases, Cyclodex® G-TA, is found to be a chiral shift reagent for several of the fluoroethers. A rough correspondence is found relating the enantiomeric separation factor of a fluoroether and the chemical shift differences between its 1H and 19F nuclei in the NMR spectrum. Based on this data, it is proposed that a simple NMR experiment can screen chiral stationary phases prior to a desired gas chromatographic