... The Journal of Organic ... reaction tube was sealed, and the mixture was heated to 80 °C and stirred for 4 h. Then the mixture was extracted with Et 2 O (25 mL × 3), and the combined organic phase was ... 19 F NMR: δ −82.6 (dt, J = 73.5 Hz, 7 Hz, 2F), −116.7 (m, 1F), −120.2 (m, 1F). ...