Polyhalogenoallenes. Part VI. Some addition reactions of perfluoropenta-1,2-diene

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Abstract
Perfluoropenta-1,2-diene is inert towards chlorine, hydrogen chloride, and hydrogen bromide at room temperature in the dark, but combines quantitatively with anhydrous hydrogen fluoride under these conditions to give cis- and trans-2H-nonfluoropent-2-ene. The latter is also obtained by treatment of perfluoropenta-1,2-diene with caesium fluoride in formamide; reaction of the diene with caesium fluoride alone provides perfluoropent-2-yne. Anhydrous methanol readily attacks perfluoropenta-1,2-diene to give trans-2H-octafluoro-1-methoxypent-2-ene and heptafluoro-1-methoxypent-2-yne. Photochemical hydrobromination of perfluoropenta-1,2-diene gives 3H-2-bromo-octafluoropent-1-ene and 1H-2-bromo-octafluoropent-2-ene (probably both as cis- and trans-isomers), while photochemical chlorination with an excess of chlorine gives 1,2,2,3-tetrachloro-octafluoro-n-pentane. The n.m.r. spectra of the reaction products are presented, and possible reaction mechanisms are discussed.

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