Thermal condensation of 2-carbomethoxy and 2-cyano-aziridines with perfluorobutene and perfluoropropene produces polyfluorinated pyrrolidines. These compounds, treated with sodium methoxide, lead to 3,4-fluorinated pyrroles. In the case of perfluoropropene, the (2 + 3) cycloaddition is not completely regiospecific.
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Leroy et al. (1976) studied this question.
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