of added CF,=CCIY to greatly accelerate the reaction. For example, in diglyme, l a reacts with C6H50K so slowly that only trace amounts of 2a can be detected after 24 h, but when 5 mol-% CF,=CCIF (relative to C5H50K) is added, 2a (15%) and 3a (3%) are formed in 20 min.The reactions described here afford a facile route to ethers, one of whose alkyl groups is fully halogenated; such ethers are not readily available via other preparative methods. More interestingly, these observations are the first good evidence for a chlorophilic attack on C-CI bonds by oxygen nucleophiles.

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