CONDENSATION OF 1,2-DIAMINES AND CARBOXYLICACIDS UNDER MICROWAVE IRRADIATION |
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| Authors: | MENG Qing-hua HUANG De-yin TIAN Feng-tao LIU Yang |
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| Institution: | 1. School of Chemistry and Chemical Eng., Shanghai Jiaotong Univ.,
2. Shanghai Institute of Organic Chemistry, Academia Sinica |
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| Abstract: | A facile method of preparation of benzimidazoles by microwave irradiation was described. The mixtures of o-phenylenediamine and carboxylic acids were heated by microwave irradiation, to give 2-substituted benzimidazoles with yields of 49%~93%. The reaction time was shortened to 3~6 min. However, the reaction of ethylenediamine with carboxylic acids did not give imidazoles but the N,N-diacyl ethylenediamines. The alphatic diamines lacked the activity to form imidazole ring. With adipic acid, intermolecular acylation took place to afford poly(ethylene adipamide). |
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| Keywords: | benzimidazole o-phenylenediamine ethylenediamine microwave irradiation |
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