The aniline was synthesized by a slightly modified procedure according to literature 1 . Under atmosphere of N2 AlCl3 (4.00 g, 30.0 mmol) was dissolved in 1,2-dichloroethane (25 mL) and cooled to 0 °C. Subsequently, 2,6-diisopropylaniline (4.00 g, 22.6 mmol) was added, tBuCl (7.88 g, 85.2 mmol) was added dropwise over a period of 10 min, during which the solution turned dark brown. Then the reaction was allowed to slowly warm up to room temperature. After having stirred the solution overnight, dichloromethane (50 mL) was added and the reaction mixture was poured on a mixture of ice (40 g) and aqueous ammonia solution (28 %, 12 mL). The white precipitate was filtered off. The organic phase was separated, washed with water (2 × 40 mL) and brine (2 ×40 mL) and dried with MgSO4. The solvent was removed under reduced pressure giving a viscous yellow oil which was recrystallized from pentane (4 mL) at -30 °C. The crystals were further purified by sublimation (45 °C, 9.0 × 10 -2 mbar) overnight to give the pure product a1 as a white solid. Yield: 2.8 g, 12.0 mmol, 53%.