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Abstract
Geminal difluorination of dithiolane 9 affords bis benzyl ether 4b which is converted to beta-fluoroenals 3Z/3E. Reaction of these enals with the stannylmethyl Wadsworth-Emmons reagent 2 produces dienyl esters 14Z/14E which are converted to highly functionalized dienylic stannanes 1Z and 1E.