DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kim, Yong-Hae | - |
dc.contributor.advisor | 김용해 | - |
dc.contributor.author | Kim, Hyung-Jin | - |
dc.contributor.author | 김형진 | - |
dc.date.accessioned | 2011-12-13T04:55:07Z | - |
dc.date.available | 2011-12-13T04:55:07Z | - |
dc.date.issued | 1983 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=63594&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/32344 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 화학과, 1983.2, [ iv, 45 p. ] | - |
dc.description.abstract | Alkaline autoxidation of various 1,3-diarylsubstituted thioureas and cyclic thioureas such as 2-mercaptobenzimidazole and naphth [2,3-d]imidazole-2-thione were carried out in the presence of excess molecular oxygen with potassium tertiary butoxide in tertiary butanol and/or dimethyl sulfoxide at 40-50℃. The reaction of 1,3-diarylsubstituted thioureas with $O_2$-t-BuOK-BuOH(and/or-DMSO) afforded 1,3-diarylureas as major products and 1,2,3-triarylguanidines as minor products. The conversion of 1,3-diphenylthiourea to the 1,3-diphenylurea underwent more smoothly in $O_2$-t-BuOK-t-BuOH than in $O_2$-t-BuOK-DMSO. The formation of 1,3-diarylureas appears to be initiated by one-electron transfer between the substrate and oxygen molecule, and then to form a peroxysulfur intermediate which has neither been isolated nor detected yet. While, the treatment of 2-mercaptobenzimidazole with $O_2$-t-BuOK-t-BuOH at 40-50℃ gave both benzimidazole-2-sulfonic acid and benzimidazole which might be formed via desulfurization from the benzimidazole-2-sulfinate intermediate which are not yet confirmed due to its unstability. Similarly, the oxidation of naphth[2,3-d]imidazole-2-thione with $O_2$-t-BuOK-t-BuOH afforded corresponding desulfurized product and sulfonic acid. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.title | Alkaline autoxidation of 1,3-diarylsubstituted thioureas and cyclic thioureas | - |
dc.title.alternative | 1,3-디아릴기 치환된 티오뇨소 및 고리 유도체의 알칼리 자동산화 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 63594/325007 | - |
dc.description.department | 한국과학기술원 : 화학과, | - |
dc.identifier.uid | 000811075 | - |
dc.contributor.localauthor | Kim, Yong-Hae | - |
dc.contributor.localauthor | 김용해 | - |
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