Bismuth nitrate as an efficient catalyst
Typical procedure
Bi(NO3)3 (0.15 mmol) was added to a mixture of 2-aminothiophenol (1 mmol), aryl
aldehyde (1.1 mmol), and aq. 30 % H2O2 (0.5 mL) in ethanol (5 mL), and mixture
was heated under reflux for the appropriate time (Table 2). The progress of the
reaction was monitored by TLC. After completion of the reaction, the mixture was
cooled to 25 °C and dissolved in CH2Cl2. The catalyst was removed by simple
filtration. Solvent was evaporated and the solid product was purified by recrystal-
lization from ethanol.
2-(2,5-Dimethoxyphenyl)benzothiazole (Table 2, Entry 3)
1H NMR (400 MHz, DMSO-d6): d = 3.85 (s, 3H), 4.01 (s, 3H), 6.86–6.91 (m, 2H),
7.24 (s, 1H), 7.41 (t, J = 8.0 Hz), 7.50 (t, J = 8.0 Hz), 7.89 (d, J = 8.1 Hz), 8.01
(d, J = 8.1 Hz) ppm; IR (KBr, cm-1): 3051, 2938, 2851, 1604, 1590, 1556, 1520,
1465, 1431, 1410, 1285, 1256, 1220, 1181, 1173, 1075, 1027, 969, 831, 790; (found:
C, 66.48; H, 4.89; N, 5.25 C15H13NO2S; requires C, 66.40; H, 4.83; N, 5.16).
Acknowledgments We are grateful to the Najafabad Branch, Islamic Azad University Research
Council, for partial support of this research.
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