ATTEMPTS TO PREPARE FLUOROETHERS WITH EMPHASIS ON THE USE OF LITHIO-PERFLUOROALKANES IN ORGANIC SYNTHESIS.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1965
- Accession Number
- AD0477989
Entities
People
- Peter Johncock
Organizations
- Royal Aircraft Establishment