Name of impurity

Mass value (m/z) (M + H)⁺

FT-IR (KBr) absorption bands (cm⁻¹)

¹H NMR chemical shift values, δ in ppm,

(multiplicity, integration)

1) Imp-1

273.34

3391.08, 3321.25, 1604.73, 1591.02, 1523.84, 1396.26, 1137.68, 1267.27, 1024.90

1.30 - 1.34, (t, 3H), 2.15 (s, 2H), 2.95 (s, 3H), 3.21 - 3.44 (dd, 2H), 3.72 (s, 3H), 3.99 - 4.04 (q, 2H), 4.24 - 4.27 (dd, 1H) 6.88 - 6.88 (d, 2H) 7.01 (s, 1H)

2) Imp-2

315.38

1651.47, 1592.95, 1524.28, 1376.37, 1136.36, 1263.21 & 1028.67

1.46 - 1.49 (t, 3H), 2.04 (s, 3H), 2.64 (s, 3H), 3.41 - 3.68 (dd, 2H), 3.8 6(s, 3H), 4.06 - 4.13 (q, 2H), 5.46 - 5.53 (q, 1H), 6.67 - 6.69 (d, 1H), 6.84 - 6.90 (m, 3H)

3) Imp-3

460.5

3344.93, 1768.91, 1615.78, 1518.53, 1358.62 1137.40, 1262.82 and 1026.74

1.43 - 1.47 (t, 3H), 2.19 (s, 3H), 2.96 (s, 3H), 3.67 - 3.71 and 4.67 - 4.76 (dd, 2H), 3.84 (s, 3H), 4.06 - 4.76 (q, 2H), 5.88 - 5.93 (dd, 1H), 7.07 - 7.28 (m, 6H), 7.48 - 7.57 (m, 1H), 8.19 (s, 1H)

4) Imp-4

446.4

3346.24, 1762.36, 1701.94, 1619.19, 1519.06, 1339.30, 1137.41, 1264.27

and 1026.83

1.50 - 1.45 (t, 3H), 2.87 (s, 3H) 3.76 - 3.70 (dd, 1H), 3.85 (s, 3H), 4.14 - 4.07 (q, 2H), 4.59 - 4.57 (dd, 1H), 5.90 - 5.85 (dd, 1H), 6.85 - 6.82 (m, 1H), 7.11 - 7.08 (m, 2H), 7.55 - 7.53 (d, 1H), 7.70 - 7.65 (t, 1H), 8.53 - 8.52 (s, 1H), 8.76 - 8.73 (d, 1H), 9.43 (s, 1H)

5) Imp-5

418.46

3369.11, 1753.53, 1694.15, 1634.38 1593.02 & 1517.22, 1351.54 & 1138.18, 1261.95 & 1026.65

1.43 - 1.469 (t, 3H), 2.80 (s, 3H), 3.75 - 3.380 and 4.80 - 4.54 (dd, 2H), 3.80 (s, 3H), 4.06 - 4.13 (q, 2H), 5.21 (s, 2H), 5.81 - 5.84 (dd, 1H), 6.79 - 6.80 (d, 1H), 6.81 - 6.82 (d, 1H), 7.08 - 7.09 ( d, 1H), 7.11 - 7.12 (d, 1H), 7.35 - 7.38 (dd, 1H)

6) Imp-6

403.44

1770.01 & 1710.29, 1595.30 & 1519.59, 1359.14 & 1141.12, 1265.66 & 1044.02

1.41 - 1.49 (t, 3H), 2.83 (s, 3H), 3.84 (s, 3H), 3.76 - 3.82 and 4.50 - 4.58 (dd, 2H), 4.07 - 4.14 (q, 2H), 5.88 - 5.93 (dd, 1H), 6.82 - 6.84 (d, 1H), 7.11 - 7.14 (d, 1H) 7.69 - 7.73 (m, 2H), 7.80 - 7.84 (m, 2H)

7) Imp-7

448.44

1780.52 & 1721.87, 1592.96, 1542.14 &1518.74, 1361.29 & 1139.57, 1262.41 & 1025.38

1.44 - 1.47 (t, 3H), 2.88 (s, 3H), 3.67 - 3.71 and 4.54 - 4.60 (dd, 2H), 3.84 (s, 3H), 4.06 - 4.12 (q, 2H), 5.90 - 5.93 (dd, 1H), 6.81 - 6.83 ( d, 1H)7.10 - 7.12 (dd, 2H), 7.86 - 7.90 (t, 1H), 8.08 - 8.10 (dd, 1H)

8) Imp-8

605.61

1775.63, 1716.83, 1612.66, 1523.70, 1366.22, 1133.05, 1263.19, 1029.96 and 3369.83

1.32 - 1.29 (m, 3H), 2.18 (s, 3H), 2.94 (s, 3H), 3.72 (bs, 3H), 4.02 - 3.96 (m, 2H), 4.27 - 4.09 (m, 2H), 5.73 - 5.69 (m, 1H), 6.94 - 6.92 (m, 2H), 7.06 (s, 1H), 7.73 - 7.72 (t, 1H), 7.94 - 7.88 (m, 2H), 8.06 - 8.04 (m, 2H), 8.54 - 8.50 (m, 1H), 9.80 -9.77 (d, 1H)