3-F-alkyl-4-ethoxycarbonylfuranes have been prepared from 2-F-alkyl-3-ethoxycarbonyl-7-oxa-(2,2,1)-bicyclo hepta-2,5-dienes by retro Diels-Alder reactions with tetracyclone (2,3,4,5-tetraphenylcyclopentadienone). The products were characterised by elemental analysis, NMR H-1 and F-19, and Mass Spectrometry.