Synthesis and Evaluation of Thiazolyl pyrazolin-5-one Derivatives as Antioxidants for Egyptian Lubricating Oil. | ||||
| Journal of Textiles, Coloration and Polymer Science | ||||
| Article 4, Volume 16, Issue 1, July 2019, Page 49-54 PDF (1.4 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jtcps.2019.9991.1020 | ||||
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| Authors | ||||
Ahmed A. Fadda1; Ahmed El- Mekabaty1; Khaled El-Saeed1; Ehab Abdel-latif  2
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| 1Department of chemistry, Faculty of Science, Mansoura University, ET-35516 Mansoura, Egypt. | ||||
| 2Mansoura University | ||||
| Abstract | ||||
| The chemical structure of pyrazole-1-carbothioamide derivative 1 was modified through building a thiazole moiety to synthesize derivatives of thiazolyl pyrazolin-5-one. The reaction of 1 with phenacyl bromide furnished the conforming thiazolyl pyrazole derivative 2, which upon base-catalyzed reaction with benzyl isothiocyanate afforded thiazolyl 4-(benzylthiocarbamoyl)-2-pyrazolin-5-one derivative 3. The diazo-coupling reaction of 2 with diazotized 4-aminoacetophenone afforded the conforming thiazolyl 4-(p-acetylphenylhydrazono)-2-pyrazolin-5-one derivative 4. The synthesized thiazolyl pyrazolin-5-one derivatives were utilized as antioxidant additives for lubricating oil. The oxidation stability study revealed that the tested compounds showed good antioxidant activities. The efficiency of the tested antioxidant additives decreases according to the order: compound 2 > compound 4 > compound 3 > compound 1. | ||||
| Keywords | ||||
| Pyrazolin-5-one; Thiazolyl-pyrazolin-5-one; Benzyl isothiocyanate; p-Aminoacetophenone; lubricating oil; Antioxidant Additives | ||||
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