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액정 폴리에스테르와 Poly(butylene terephthalate)의 에스테르 교환반응
한도수,김두화,조성동,조병욱,Han, Do Soo,Kim, Doo Hwa,Cho, Sung Dong,Jo, Byung Wook 대한화학회 1997 대한화학회지 Vol.41 No.3
에스테르 교환반응은 고분자 블랜드의 가공시 자체 상용화제를 만들 수 있어 폴리에스테르의 공업적제조에 이용되어질 수 있다. 따라서 에스테르 교환반응에 대한 연구의 일환으로서 열방성 액정고분자인 TR-4,6(poly(tetramethylene-4,4'-terephthaloyldioxydibenzoate-co-hexametylene-4,4'-terephthaloyldioxydibenzoate)를 합성하게 되었으며 이것을 엔지니어링 플라스틱인 폴리부틸렌테레프탈레이트(PBT)와 블랜딩을 하였다. 이 두 구성고분자 사이의 에스테르 교환반응은 IR, DSC, 및 $^{13}C-NMR$에 의한 통계적 처리방법에 의하여 분석하였으며, 교환반응 진행속도와 모노머의 반복단위 서열분포도 조사 연구하였다. The transesterification reaction could be used to the technical production as it forms an in-situ compatibilizer during the processing of polymer blends. Thus, TR-4,6(poly(tetramethylene-4,4'-terephthaloyldioxydibenzoate-co-hexametylene-4,4'-terephthaloyldioxydibenzoate), one of thermotropic liquid crystalline polymers was synthesized and was blended with PBT(polybutylene terephthalate), one of engineering plastics, to study the transesterification reaction. The transesterification reactions between two components, TR-4,6 and PBT, were monitored by IR, DSC and $^{13}C-NMR$ and analyzed by a statistical treatment method. Also, the reaction rates and the sequence distributions of repeating unit were (calculated and) invesitigated.
Tributyltinhydride에 의한 4-Bromophenylacetychloride의 환원반응
한도수,조성동 조선대학교 기초과학연구소 1994 自然科學硏究 Vol.17 No.1
4-Bromophenylacetylchloride was reduced to 4-bromophenylacetaldehyde in good yield by tributyltinhydride and tetrakis(triphenylphosphine)palladium(0) as a catalyst.
3-Chloromethyl-3-Methyl Oxetane의 합성
박정환,한도수,허선아,조성동 조선대학교 기초과학연구소 1993 自然科學硏究 Vol.16 No.1
3-chloromethyl-3-methyl oxetane(CMMO) was synthesized with 3-methy-3-methoxytosyl oxetane(MMTO) and LiCI in 68% yield.
Asymmetric Reduction of Ketone with Borane Reagent Catalyzed by Chiral Oxazaborolidine(BDPHMP)
Lim, Hyang-Ju,Han, Do-Soo,Kim, Gi-Youn,Kang, Dong-Ku,Kim, Doo-Hwa,Cho, Sung-Dong 조선대학교 기초과학연구소 1998 自然科學硏究 Vol.21 No.1
The asymmetric reduction of aromatic ketones with boron hydride reagents complexed with chiral oxazaborolidine (BDPHMP) prepared from the reaction of (S)-(-)-2-(diphenylhydroxymethyl)pyrrolidine and borane has been investigated in order to characterize the role of boron hydride reagent in asymmetric induction. The boron hydride reagents applied in this reduction are thexylborane (ThxBH_2) as a representative alkylborane and monobromoborane (H_2BBr) as a representative haloborane. The reduction of acetophenone yields 1-phenylethanol in 63.8%ee by ThxBH_2-BDPHMP system with the consistent R-configuration. On the other hand, the reduction of acetophenone yields 1-phenylethanol in 79.3%ee by H_2BBr-BDPHMP system with the consistent R-configuration. Reduction of simple aromatic ketones, acetophenone yields 1-phenylethanol in with R-configuration 63.8%ee by ThxBH_2-BDPHMP. On the other hand, the inducibility achieved by H_2BBr appears to the higher than that achieved by ThxBH_2. Thus, the enantiomeric excess of the alcohol produced in the reaction of acetophenone was 79.3%ee, with the consistenct R-configuration. The asymmetric inducibilitis are in the order of H_2BBR > ThxBH_2. Consequently, the higher steric hindrance of ThxBH_2 and BH_2Br than that of BH_3 seems to inhibit the coordination of these boranes to oxazaborolidine to result in the lower asymmetric induction.
Metal Oxide Sensor Array를 이용한 사과와 귤의 신선도 분석
임향주,한도수,조성동,김기윤 조선대학교 기초과학연구소 2000 自然科學硏究 Vol.23 No.1
The Electronic Nose has been designed to provide objective and reproducible aroma discrimination on a wide variety to human nose. The sensor array in combination with sophisticated chemometrics and artificial neural network software provides the output displaying the closeness of difference in aroma patterns of different samples. As an application the system has been used to discriminate of the fresh and decomposing apples and oranges. The discrimination has been successfully demonstrated.
Metal Oxide Sensor를 이용한 알코올 분석
林香住,姜東求,韓道洙,趙成棟 조선대학교 생산기술연구소 1996 生産技術硏究 Vol.18 No.2
A resistance value of the metal oxide sensor for alcohols was measured by metal oxide senor (FOX2000). T30/1 sensor showed the best response to propanols. The pattern analysis could be measured to ppm and resistance could be processed as various forms. We could find that six sensor responses for propanols were better than those of methanol, when alcohols were displayed at the same time on the radar axis plane with maximum value of △R/Ro by sensors. Alcohols and distilled water were analysed with a principle component and they could be confirmed as being separated clearly.
김두화,박정환,한도수,허선아,김성현,조성동 조선대학교 기초과학연구소 1992 自然科學硏究 Vol.15 No.1
The reaction of Asymmetrical organotins with acid chlorides in the presence of Benzylbis (triphenylphosphine) palladium(Ⅱ) chloride gave good yields of ketones in chloroform.