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LiBr 와 CaBr2 가 흡착된 알루미나상에서 일어나는 염화 알킬의 브롬화반응
박영훈,신영문,조범준,김창배 ( Yeong Hoon Park,Young Mun Shin,Beom Jun Cho,Chang Bae Kim ) 한국공업화학회 1996 공업화학 Vol.7 No.5
Several alkyl chlorides were brominated using LiBr and CaBr₂adsorbed on alumina in the absence of solvent. The yields of alkyl bromides were fairly high. Such a high reactivity by these bromide salts might be due to the interaction of minute amount of water and the salt on alumina. Differential scanning calorimetry (DSC) thermogram was provided and discussed.
LiBr와 CaBr<sub>2</sub>가 흡착된 알루미나상에서 일어나는 염화 알킬의 브롬화반응
박영훈,신영문,조범준,김창배,Park, Yeong Hoon,Shin, Young Mun,Cho, Beom Jun,Kim, Chang Bae 한국공업화학회 1996 공업화학 Vol.7 No.5
알루미나에 LiBr와 $CaBr_2$를 각각 흡착시켜 용매가 없는 상태에서 여러 가지 염화 알킬과 반응시켜 좋은 수득률로 해당하는 브롬화 생성물을 얻을 수 있었다. 이러한 높은 반응성은 알루미나에 흡착되어 있는 극소량의 물과 브롬화 금속간의 상호작용이 알루미나 상에서 일어날 수 있기 때문이라는 것을 Differential scanning calorimetry (DSC) 열분석 실험과 문헌을 통하여 고찰하였다. Several alkyl chlorides were brominated using LiBr and $CaBr_2$ adsorbed on alumina in the absence of solvent. The yields of alkyl bromides were fairly high. Such a high reactivity by these bromide salts might be due to the interaction of minute amount of water and the salt on alumina. Differential scanning calorimetry (DSC) thermogram was provided and discussed.
金昌培,朴永勳 단국대학교 대학원 1990 學術論叢 Vol.14 No.-
1, 3-Disubstituted-8-aza-quinazoline-2, 4-dione derivatives were synthesized by the following methods using 2-chloronicotinic acid as starting material(call method A and method B in this paper). In method A 1-substituted-8-aza-quinazoline-2, 4-diones were prepared by the reaction of 2-(N-substituted amino)nicotinic acid with urea at high temperature, while in method B 1-substituted-8-aza-quinazoline-2, 4-diones prepared by the reaction of 2-(N-substituted amino)nicotinamide with ethyl carbonates at low temperature. The former requires only 2-3 hours of reaction time at 20-40℃, while the letter requires 7 hours at 180-200℃ Yields for two methods obtained were 60% all. It is clear that the method B is more efficient than the method A. Yields of 1, 3-disubstituted-8-aza-quinazoline-2, 4-dione as object was obtained about 60% by the reaction of intermediate material with alkylate in the DMF solvent. It has been affirmed that the mechanism of reactions involved in synthesis was of nucleophilic substitution. The molecular structure, and molecular weight of 1, 3-disubstituted-8-aza-quinazoline-2, 4-diones were confirmed by the analysis of physico-chemical instrumentation such an IR, NMR, and MS spectra, and the physical properties were examined. And the values of elementary analysis for C, H and N were in very good agreement with the expected results.