CO2 Improved Synthesis of Benzimidazole with the Catalysis of a New Calcium 4-Amino-3-hydroxybenzoate
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In this paper, we explored the synthesis of benzimidazole by the reaction of DMF and o-phenylenediamine. In the process of catalyst screening, we found that 4-amino-3-hydroxybenzoic acid, benzoic acid, and benzene-1,3,5-tricarboxylic acid could catalyze the reaction. Moreover, the calcium 4-amino-3-hydroxybenzoate and CO2 could more effectively catalyze the reaction, the synergistic effect of CO2 and 4-amino-3-hydroxybenzoic acid calcium salt can increase the yield of benzimidazole from 28% to 94%.
1976 ◽
Vol 31
(11-12)
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pp. 693-699
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1986 ◽
Vol 33
(7)
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pp. 514-518
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1964 ◽
Vol 19
(5)
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pp. 398-405
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1998 ◽
Vol 234
(1-3)
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pp. 223-230
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