Tert-Butyl hypochlorite → 1,3,4-Tris(2,6-difluorophenyl)-1H-1,2,3-triazolium hexafluorophosphate

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Reaction Steps

To a stirred suspension of triazene 8d (808 mg, 3 mmol) and anhydrous potassium hexafluorophosphate (750 mg, 4 mmol) and (Z)-1-Bromo-2-(2,6-difluorophenyl)ethene 11q (1.32 g, 6 mmol) in dry dichloromethane (20 mL) in the dark at −78° C. is added tert-butyl hypochlorite (500 μL, 4.4 mmol), upon which the mixture instantly darkens. The mixture is stirred overnight as it is slowly allowed to warm to room temperature. The contents are then filtered, and the solid residue is washed with dichloromethane. The filtrate is collected, and volatiles are evaporated under reduced pressure. Diethyl ether is then added, and the mixture is vigorously triturated for ca. 1 hour, with occasional scratching of the glass surfaces to ensure efficient mixing. Filtration and washing with copious quantities of diethyl ether afford, after drying under vacuum, triazolium salt 10dq as an off-white solid (1.45 g, 88%). Analytical samples were obtained after recrystallization by vapor diffusion of diethyl ether in an acetonitrile solution of 10dq. 1H-NMR ((CD3)2SO, 300 MHz): δ=10.37 (s, 1H), 8.05-7.90 (m, 2H), 7.89-7.81 (m, 1H), 7.69 (t, J=8.9 Hz, 2H), 7.61 (t, J=8.9 Hz, 2H), 7.44 (t, J=8.9 Hz, 2H). 13C-NMR (((CD3)2SO, 75 MHz): δ=159.4 (dd, J=253, 4 Hz), 155.7 (d, J=257 Hz), 155.3 (d, J=257 Hz), 137.1 (2t, J=10 Hz), 136.2, 135.9 (t, J=10 Hz), 134.6, 114.0 (d, J=18 Hz), 113.8 (d, J=18 Hz), 113.0 (d, J=20 Hz), 112.6 (t, J=14 Hz), 110.3 (t, J=15 Hz), 99.1 (t, J=18 Hz). 19F-NMR (CD3CN, 282 MHz): δ=−71.9 (d, J=705 Hz, 6F), −110.3 (2F), −118.8 (2F), −119.0 (2F). HR-MS (ESI): Calcd. for C20H10F6N3 [M+]: 406.0773. found 406.0784.

Provenance & Evidence