1-Chloro-1,1,3,3,3-pentafluoro-2-propanone → 1-(1,1,1,2,3,3-Hexafluoro-3-chloro-2-propoxy)-pentafluoro-2-propene

A suspension of potassium fluoride (5.80 g, 0.10 mol) and diglyme (100 ml) was stirred at 20° C. in a cooling bath while chloropentafluoroacetone (18.3 g, 0.10 mol) was distilled in. After the potassium fluoride had dissolved, perfluoroallyl fluorosulfate (23.0 g, 0.10 mol) was added rapidly with cooling of the reaction mixture. The resulting exothermic reaction was accompanied by the precipitation of solid. The mixture was stirred at 25° C. for one hour, and then the volatile components were transferred to a strap cooled to -80° C. by heating the reaction mixture at 42° C. (5 mm Hg). The volatile product was distilled from phosphorus pentoxide to give 1-(1,1,1,2,3,3-hexafluoro-3-chloro-2-propoxy)-pentafluoro-2-propene, (19.6 g, 0.059 mol, 59%) bp 85°-86° C. which was characterized by: λmax 5.55 (CF=CF2) and 7-10 μm (CF, C--O); 19F NMR, -68.6 (m) 2F, CF2Cl, -69.1 (m) 2F, CF2O, -78.8 (m) 3F, CF3, -93.2 (d J=54.7 Hz, each member d J=39.8 Hz, t J=7.5 Hz), 1F, cis-CF2 -CF=CF, -105.9 (d J=116.7 Hz, each member, d J=54.7 Hz, t J=24.0 Hz) 1F, trans--CF2CF=CF, -141.2 (t J=22.8 Hz, each member m) 1F, CF, and -190.4 ppm (d J=116.7 Hz, each member d J=39.8 Hz, t J=13.4 Hz) 1F, --CF2CF=C.

1. distillationwas distilled in
2. dissolutionAfter the potassium fluoride had dissolved
3. temperaturewith cooling of the reaction mixture
4. customThe resulting exothermic reaction
5. customwas accompanied by the precipitation of solid
6. temperaturecooled to -80° C.
7. temperatureby heating the reaction mixture at 42° C. (5 mm Hg)
8. distillationThe volatile product was distilled from phosphorus pentoxide

ORD-Eintrag

ord-796f947e7d93489d9d4685dae4886e97

Quelldatensatz

uspto-grants-1981_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US04273729