Scope of 1-naphthaldehyde for ortho-C–H methylation^a,b.

^aExperiments were performed under the following reaction conditions: 1a (0.3 mmol), CH₃BF₃K (0.6 mmol), [Cp*IrCl₂]₂ (5 mol%), TDG (20 mol%), AgNTf₂ (0.06 mmol), AgOAc (0.75 mmol), AcOH (1.5 mL), 90 °C, N₂, sealed tube, 5–10 min.

^bIsolated yields.

^cYields were determined by ¹H NMR analysis of the crude reaction mixture using CH₂Br₂ as the internal standard.

^dTDG28 was used instead of TDG25.

^eTDG29 was used instead of TDG25, 30 min.