Accession Number : AD0477989


Title :   ATTEMPTS TO PREPARE FLUOROETHERS WITH EMPHASIS ON THE USE OF LITHIO-PERFLUOROALKANES IN ORGANIC SYNTHESIS.


Descriptive Note : Technical rept.,


Corporate Author : ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)


Personal Author(s) : Johncock,Peter


Report Date : Nov 1965


Pagination or Media Count : 44


Abstract : In the search for new elastomers suitable for use at high temperatures, certain aliphatic poly(fluoroethers) appear promising candidates for the base polymer. Attempts made to prepare as a model (bis-(1-1-di-H-heptafluorobutyl) ether, by potential polymer forming reactions, were unsuccessful: perfluoro-n-propyl-lithium was insufficiently stable to undergo condensation with sym-dichlorodimethyl ether, and O-alkylation of 1-1-di-H-heptafluorobutyl trifluoromethane- sulphonate with sodium 1-1-di-H-heptafluorobutoxide could not be effected. Perfluoro-n-heptyl-lithium and 1-4-dilithio-octafluorobutane were prepared by halogen-metal exchange and characterised by their reactions with acetaldehyde: they are much less stable than perfluoro-n-propyl-lithium. The proportion of alkyl-lithium compound used for the exchange had a considerable effect on the stability of the fluoro-organometallic reagent. Perfluoro-n-propyl-, perfluoroisopropyl-, and perfluoro-n-heptyl-lithium could be carboxylated at low temperature. (Author)


Descriptors :   *FLUORINE COMPOUNDS , SYNTHESIS(CHEMISTRY) , FEASIBILITY STUDIES , POLYMERS , ETHERS , ELASTOMERS , ALKANES , ORGANOMETALLIC COMPOUNDS , LITHIUM COMPOUNDS , INFRARED SPECTRA , CARBOXYLIC ACIDS , SALTS , OCTANOIC ACID , FATTY ACIDS , BUTANES , UNITED KINGDOM


Subject Categories : Polymer Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE