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A series of low molecular weight perfluoroalkyl ethers (PFAEs) were synthesized by direct fluorination. Viscosity-temperature properties and oxidation stabilities were determined. Viscosity-temperature correlations indicated that increases in branching and increases in the size of the branching substituent caused a deterioration in viscometric properties (i.e., an increase in ASTM slope). In addition, increasing the ratio of carbon to oxygen in these compounds also increased the ASTM slope. Preliminary oxidation stability measurements indicated that highly branched PFAE fluids (i.e., those containing quaternary carbons) may be less stable than either those containing a single trifluoromethyl pendant group or those containing no branching at all. Perfluoroalkyl ethers are a class of fluids which exhibits excellent thermal and oxidative stabilities (Gumprecht,

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A new synthesis has been developed for preparation of M(R)" metal alkyls and other similar compounds. The reactive free radicals CH3•, CF3•, and SiF3• have been cocondensed with metals on a cold finger at -196 °C and oxidize the metals to the compounds Hg(CF3)2, Te(CF3)2, Te2(CF3)2, Bi(CF3)3, Hg(CH3)2, Cd(CH3)2, Bi(CFI3)3, Sn(CH3)4), Ge(CH3)4, and Hg(SiF3)2.