(4.65 g, 92 %). 1H NMR spectroscopy revealed a conversion of C2-H into C2-D of 97.7 % and of C4-H+C5-H into C4-D+C5-D of 94.1%. 1H NMR (CD3CN, 400 MHz): (ppm) = 3.81 (s, N-CH3, 6H). Trace signals at = 7.31 (s, H-4+H-5) and = 8.35 (s, H-2) were visible in the spectrum. 13C NMR (CD3CN, 100 MHz): (ppm) = 37.01 (NCH3), 116.47 (CF3), 119.66 (CF3), 121.63 (C-4+C-5), 122.85 (CF3), 124.17, 124.48, 124.67, 124.79 (C4+C-5), 126.03 (CF3), 137.23, 137.56, 137.89 (C-2). 19F NMR (CD3CN, 376 MHz): (ppm) = −80.18 (s, CF3).
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