Here we report BF3-OEt2 as an efficient catalyst for the HF shuttling between fluoroalkanes and alkynes to form an alkene and a difluoroalkane. We show that there is an aspect of reversibility to this reaction and that difluoroalkane products can be converted back into fluoroalkene intermediates. Our approach requires BF3-OEt2 to act as a catalyst for both defluorination and fluorination events in a single catalytic sequence. Lewis acidic group 13 compounds have been reported as both reagents and catalysts for the hydrofluorination of internal alkynes and the defluorination of fluoroalkanes, and represented a logical starting point for the development of an HF shuttle catalyst. Very recently, BF3-OEt2 has been reported as a catalyst for the homologation of fluoroalkanes with diazoesters, and the intramolecular fluorocarbamoylation of alkynes. 24 The further development of this process was complicated by the generation of the alkyne hydration side product, 1,2diphenylethan-1-one, in significant yields. While performing reactions in fluorinated ethylene propylene (FEP) tubes reduced the yield of 1,2-diphenylethan-1-one, its formation could not be excluded entirely.