| 摘要 |
A process is disclosed for preparing an adduct of the formula R1CF2CH2OCF3-a-m(C2HnX4-nF)mR2a wherein R1 is selected from the group consisting of -(CF2)pH and -CpF2p+1 where p is 0 or an integer from 1 to 6; R2 is selected from the group consisting of -H, -CHF2, -CHFCF3, -CHFOCF3, -CHFO(CF2)2CF3, and -CHClF; each X is independently selected from the group consisting of Br, Cl and F; a is 0 or 1; m is 1 or 2, provided that when a is 1 and R2 is other than hydrogen, then m is 1; and n is 0, 1 or 2. The process involves reacting a fluorinated ether of the formula R1CF2CH2OCF3-aR2a with an olefin of the formula C2HnX4-n in the liquid phase in the presence of antimony pentafluoride catalyst. Also disclosed is a process for preparing unsaturated ethers of the formula R1CF2CH2OCF3-a-m(C2HnX4-nF)m-q(C2Hn-1X3-nF)qR2a wherein R1, R2, X, a, m, and n are as indicated above, and q is an integer from 1 to m. The process involves contacting the fluorinated ether of the formula R1CF2CH2OCF3-a-m(C2HnX4-nF)mR2a, provided that C2HnX4-nF is selected from the group consisting of -CClFCClF2, -CCl2CCl2F, -CHClCCl2F, -CHClCHClF and -CCl2CHClF, with a dehalogenation catalyst. Certain unique saturated ethers of the formula R1CF2CH2OCF3-a-m(C2HnX4-nF)mR2a and certain unique unsaturated ethers of the formula R1CF2CH2OCF3-a-m(C2HnX4-nF)m-q(C2Hn-1X3-nF)qR2a are also disclosed.
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