Polyhalogenoheterocyclic compounds. Part 35. Reactions of fluorinated alkenes and cycloalkenes with enolate anions

Abstract

Reactions of compounds that are oligomers of tetrafluoroethylene, with enolate anions derived from ethyl acetoacetate and acetylacetone, give fluorinated pyran derivatives whereas an uncyclised product is obtained from diethyl malonate. Similar reactions with perfluoro-but-2-ene, -cyclohexene, and -cyclopentene give furan or pyran derivatives. The different behaviour of these systems is rationalised.