Stereoselective Ring-Opening of <i>gem</i>
-Difluorocyclopropanes: An Entry to Stereo-defined (<i>E</i>
,<i>E</i>
)- and (<i>E</i>
,<i>Z</i>
)-Conjugated Fluorodienes
The ring‐opening of gem‐difluorocyclopropyl acetaldehydes producing selectively (E,E)‐ and (E,Z)‐conjugated fluorodienals is described. Two stereo‐divergent methods are presented to access both stereoisomers from a common precursor, in high yield and selectivity. The mechanistic aspect of these transformations is discussed.