Under the optimised conditions, pentafluoropyridine could be converted into 2,3,5,6tetrafluoropyridine 5a in 99 % using 10 mol% 1-Al + 10 mol% NaBAr F 4 as a pre-catalyst mixture and 10 equiv. of Et3SiH as the terminal reductant. Control reactions using solely 1-Al or NaBAr F 4 led to minimal conversion, similarly NaBPh4 was not an active additive under these conditions.