Alkyl fluoroformates RHOC(O)F are a new family of excellent alkylating agents. Perfluoroacylfluorides, selected perfluoroketones and fluoroolefins can be alkylated to hydrofluoroethers RF–O–RH and hydrofluoroalkanes RF–RH, respectively. Potassium fluoride and cesium fluorides catalysts in glymes at 50–100 °C are the preferred experimental conditions.
A deeper insight into direct trifluoromethoxylation with trifluoromethyl triflate
作者:Olivier Marrec、Thierry Billard、Jean-Pierre Vors、Sergii Pazenok、Bernard R. Langlois
DOI:10.1016/j.jfluchem.2009.11.006
日期:2010.2
Commercially available fluorides (silver fluoride and n-tetrabutylammonium triphenyldifluorosilicate), combined with TFMT, allow a simple generation, in situ, of silver and n-tetrabutylammonium trifluoromethoxides which were able to react with electrophilic substrates. Silver trifluoromethoxide, which is usually more efficient than n-tetrabutylammonium trifluoromethoxide, converts, under mild conditions, primary aliphatic bromides and iodides, as well as primary and secondary benzylic or allylic bromides to the corresponding trifluoromethoxylated compounds. Several trifluoromethyl ethers, which could be valuable building-blocks, were prepared in such a way. (C) 2009 Elsevier B.V. All rights reserved.
Preparations of carboxylic acid esters containing heptafluoroisopropyl groups
作者:T. Suyama、S. Kato、Y. Mizutani
DOI:10.1016/s0022-1139(00)80184-0
日期:1992.1
fluoroglyoxylic acidesters and fluoroformic acidesters with perfluoropropene (PFP) yielded perfluoro(3-methyl-2-oxobutyric) acidesters and perfluoroisobutyric acidesters, respectively. Oxamide derivatives and 2,3-quinoxalinediol have been prepared by the reaction of perfluoro(3-methyl-2-oxobutyric) acidesters with amines and o- phenylenediamine, respectively. Perfluoro(3-methyl-2-oxobutyric) acid esters