67727-69-9Relevant academic research and scientific papers
SURFACE ACTIVE SUBSTANCES CONTAINING AN OLIGO(HEXAFLUOROPROPENE OXIDE) CHAIN AS A HYDROPHOBIC AND OLEOPHOBIC MOIETY
Ishikawa, Nobuo,Sasabe, Mikio
, p. 241 - 254 (2007/10/02)
Oil soluble surface active substances, (HFPO)n-Ar, where Ar is an aryl group and (HFPO)n is an oligo(hexafluoropropene oxide) group, n = 2 - 5, were prepared and tested for their surface activities in toluene or m-xylene.Addition of a small amount of (HFPO)4-6-Ar (0.2 - 0.5 wtpercent) was found to decrease remarkably the surface tension of these solvents (down to 12 - 14 dyncm-1 at 20 deg C).Water soluble surfactans (HFPO)n-Ar'SO3Na, where Ar' is an arylene group, were also prepared by sulfonation of (HFPO)n-Ar.Some of these subtances (n = 4 - 6) decreased the surface tension of water down to 16 dyncm-1 at 20 deg C in the concentration of 10-4 - 10-5 molel-1.
FLUORO-KETONES. V REACTIONS OF ALKYL AND ARYLLITHIUM COMPOUNDS WITH PERFLUOROALKYLETHER ESTERS
Chen, Loomis S.,Tamborski, Christ
, p. 43 - 54 (2007/10/02)
n-Butyllithium and a variety of aryllithium compounds have been shown to react with a perfluoroalkylether ester (RfORfCO2R) at -78 deg C to produce perfluoroalkylether ketones.In the absence of competing reactions, which may be due to additional reactive groups on the ester, high yields of ketones can be prepared.Steric hindrance adjacent to the carbonyl group has an important effect on rates of reactions.Low reaction temperature (-78 deg C) is an important factor when secondary esters are used.At higher reaction temperatures (> -30 deg C), the secondary esters produce decreased yields of ketone due to the instability of the intermediate lithium salt of the hemiketal which decomposes to an aryl ester and a perfluorinated olefin.
