A range of conditions were tested to explore phosphine, silane and solvent effects on the HDF of 1 (Table ). Changing the solvent from o-C6H4F2 to MeCN had a significant, positive effect on the reaction, and gave 67% of 2 after 18 hours at 60 o C and 76% after 44h (Table , entry 2) alongside a small amount of 3 (4%), trace unreacted 1 and small quantities of other unidentified fluorinated products. Changing the silane to Ph2SiH2 significantly increased the reaction rate (Table , entry 3), allowing a lower temperature to be used and giving 84% of 2 after only 18h at 20 o C, in addition to a small amount of 3 (7 %). Further H/Ph substitution on the silane, however, only led to trace amounts of 2 when Ph3SiH was used (Table , entry 4) with most of the starting material 1 left unreacted, alongside the formation of 8% of 3.