| | Name of impurity | Mass value (m/z) (MH)+ | FT-IR (KBr) absorption bands (cm−1) | 1H NMR chemical shift values, in ppm, (multiplicity, integration) |
| | (1) Imp-A | 210.6 | 3145.80, 2965.68, 1664.21, 1531.82, 1486.08, 1326.72, 1183.89 | 3.64–3.72 (t, 4H), 1.792–2.07 (m, 4H)
4.43–4.45 (bs, 1H), 5.73 (s, 1H),
2.28 (s, 3H), 2.87–2.91(t, 2H), | | (2) Imp-B | 221.5 | 3057.86, 2934.75, 2500.67, 1612.45, 1417.35, 822.24 | 7.69–7.73 (dd, 1H), 8.12–8.17 (dd, 1H),
7.29–7.36 (td, 1H), 3.50–3.55 (m, 1H),
2.13–2.19 (dd, 4H), 3.02–3.11 (dd, 2H),
3.35 (m, 1H), 9.30 (s, 1H) | | (3) Imp-C | 425.2 | 1721.52, 1655.23, 1608.81, 1519.39, 1276.03, 959.64 | 2.20–2.27 (m, 2H), 2.32–2.38 (m, 4H),
2.41 (s, 3H), 2.74–2.76 (t, 2H),
3.02–3.07 (dd, 2H), 3.14–3.23 (m, 4H),
3.48 (s, 1H), 3.73–3.76 (t, 2H),
4.02–4.06 (t, 2H), 7.31–7.38 (td, 1H),
7.72–7.75 (dd, 1H), 8.18–8.23 (dd, 1H) | | (4) Imp-D | 443.00 | 3399.9, 3054.70, 1638.38, 1528.97, 1474.56, 1268.70, 1117.65, 959.45 | 7.30–7.36 (td, 1H), 8.01–8.04 (dd, 1H),
7.71–7.74 (dd, 1H), 1.78–2.03 (m, 6H),
3.15–3.23 (m, 4H), 3.33–3.41 (m, 3H),
3.00–3.04 (t, 2H), 3.60–3.71 (m, 1H),
3.89–3.95 (td, 1H), 2.60–2.70 (d, 2H),
4.45 (s, 1H), 2.29 (s, 3H), 5.98 (s, 1H) | | (5) Imp-E | 411.00 | 3059.07, 2942.22, 2757.28, 1651.47, 1610.70, 1591.93, 1536.55, 1270.52, 958.74 | 7.00–7.05 (td, 1H), 7.67–7.70 (dd, 1H),
7.20–7.23 (dd, 1H), 3.01–3.08 (q, 1H),
2.04–2.10 (m, 4H), 2.23–2.27 (td, 2H),
2.50–2.54 (dd, 2H), 2.73-2.77 (dd, 2H),
3.14–3.17 (t, 2H), 2.83–2.86 (t, 2H),
3.89–3.92 (s, 2H), 1.84–1.89 (m, 2H),
1.91–1.96 (m, 2H) |
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