PTFE (250 mg powder, 1 μm particle size, Sigma-Aldrich, Mn = 10 6 -10 7 ), 1 (250 mg, 0.35 mmol, 8 equiv. repeat units), 4-(dimethylamino)pyridine (DMAP 85 mg, 0.70 mmol) and benzene (10 mL) were combined under an inert atmosphere of argon. Jones and co-workers have shown that the magnesium nucleophile used in this reaction, 1, displays enhanced reactivity on the addition of a Lewis base. The reaction mixture was agitated and left to proceed for 16 h at 25 °C. The red solution turns dark red-brown as the reaction progresses, PTFE remains undissolved throughout and it is assumed the process is heterogeneous. The reaction mixture was filtered to remove PTFE and the mother liquor was concentrated to a brown solid, which was identified by multinuclear NMR spectroscopy to be 2 (Figure ). Recrystallisation of the crude product was achieved by slow evaporation of a concentrated benzene solution. 2 was isolated in 85 % yield based on 1 as the limiting agent. 2 demonstrates a characteristic resonance at  = -183.9 ppm in the spectrum respectively consistent with little change to the bulk sample on reaction with 1 (Figure ).