Abstract
The thermal decomposition of perfluoroalkyl Grignard reagents (R fMgX), formed from halogen-metal exchange with alkyl Grignard reagents, provides a good synthetic route to trans-1-haloperfluorovinyl compounds. ▪ The decomposition of R fMgX (where X = Cl, Br, I) in the presence of RMgX generally leads to a mixture of trans-1-alkylperfluorovinyl and trans-1-haloperfluorovinyl compounds. However, the choice of RMgX with respect to both the alkyl group and halogen is critical as regards the formation of the trans-1-alkylperfluorovinyl compounds. Several possible mechanisms are suggested to account for the experimental observations.
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