Detail of "2251-83-4"

Reference

Polyfluorocycloalkenes

Polyfluorocycloalkenes. Part XVII. Further preparations of alkoxynonafluorocyclohexenes and their pyrolyses to polyfluoro-2-cyclohexenones. Plevey, Raymond G.; Sparrow, David J.; Tatlow, John Colin (Chem. Dep., Univ. Birmingham, Birmingham B15 2TT, UK). J. Fluorine Chem., 26(4), 515-31 (English) 1984. CODEN: JFLCAR. ISSN: 0022-1139. DOCUMENT TYPE: Journal CA Section: 24 (Alicyclic Compounds) Reactions between decafluorocyclohexene and HOCH2CH2X (X = Cl, Br, I, OMe) gave, in each case, a 1:3 mixt. of the enol ethers I and II. Pyrolysis of the MeO analog over glass or alumina at 520° gave octafluoro-2-cyclohexenone (III), also obtained, in good yield, by pyrolysis of the known 1-ethoxy- and 1-(2-acetoxyethoxy) analogs. The other 1-alkoxides gave the same enone, but accompanied by side products. 355-75-9 is also in the experiment.In this study，355-75-9 is also used. Pyrolyses at lower temps. gave much unreacted 1-alkoxide, but no rearrangement to 3-alkoxide was detected.Chemical with cas number 2251-83-4 also plays role. In contrast, the 3-ethoxy- and 3-(1-bromoethoxy) analogs decompd. to a greater extent at 390°, to give the octafluoroenone, but also gave some isomeric 1-alkoxide in each case. Reaction of III with chlorides and bromides gave the resp. 3-chloro- and 3-bromo-2-enones, whereas with base, a haloform cleavage took place within the conjugated system to give cis-6H-octafluoro-5-hexenoic acid. ...