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나트형 불소 4규소운문[NaMg_2.5(Si_4O_10)F_2]의 이온교환(Ⅱ)
崔世千,宋宗澤,申榮文 단국대학교 대학원 1984 學術論叢 Vol.8 No.-
Ion exchange of Nafluortetrasilicic Mica (NaTSM) by univalent cations of Li^+, K^-, and bivalent cations of Mg^2+, Ca^2+, Ba^2+, was studied to investigate the fundamental properties of cation exchangability of it. The absorbed equivalents of the alkali and alkali earth metal ions were smaller than Na^2+ ion equivalents dissolved from the NaTSM. The difference of their ion exchange capacities was changed by the kind and concentration of the cations and was considered that H^+ ions from the dissociation of water were absorbed in the surface of the NaTSM. H^+ ion and cation exchange capacities were about 80% of the interlayer Na^+ ion in the NaTSM, and it was considered in terms of the particle size and the drying condition of the starting material.
Episulfide유도체의 산화성2중화 및 플루오르화 반응에 관한 연구
崔世千,崔鐘壁 단국대학교 1993 論文集 Vol.27 No.-
Episulfide derivatives were prepared by the reaction of the corresponding ethylene oxide derivatives, such as propylene oxide and 1,2-butylene oxide with potassium cyanate. These episulfide derivatives were converted to sulfoixdes by oxidation with MCPB. The pyrolysis of 1,2-butylene sulfoxide, unlikely in case of propylene sulfoxide produced dimerized compound which does not show any olefinic hydrogen according to IR and NMR, probably because concerted reaction is not adequate with mehtylene group directly bonded with methyl group which might cause steric hindrance. 1,2-Dufluorobutane, a vicinal difluoride, was prepared from the reaction of 1,2-butylene sulfoixde with diethylaminouslfutriluoride through a ring opening and fluoride shift.
N-1, C-7, 치환된 Quinoline 유도체의 합성에 관한 연구
최세천,김문식 단국대학교 대학원 1988 學術論叢 Vol.12 No.-
Substitution reaction was carried out on the N-1 and C-7 Position of quinoline nucleus. Alkyl group substitution reaction on the N-1 was easily conducted, while phenyl group substitution reaction directly on the N-1 position was Unexpectedly difficult, Therefore, quinoline nucleus was formed, after aniline was substituted with ethoxide and cyclized under basic condition. At C-7 position various nitrogen heterocyclic Compounds were replaced with chloride without difficultly.
Pyrrolidine 유도체의 산화성 분해 반응에 관한 연구
崔世千,白充善 단국대학교 1992 論文集 Vol.26 No.-
N-alkyl substituted pyrrolidine was easily oxidized by either perbenzoic acid or ozone, forming pyrrolidine N-oxide. Because pyrrolidine N-oxide is relatively more stable than small N-hetero ring componds such as the azirdine or azetidine N-oxide, pyrrolidine N-oxide formed was easily protonated by benzoic acid to give a salt, which was decomposed at 120℃ Pyrrolidine N-oxide formed by ozone, however, was resulted in olefin and N-hy-droxyl compound in a molecule, in which thermally sigmatropic rearrangement, w^2s+π^s+σ^s, was allowed. Furthermore, it was found that the hydrogen bonded to ring carbon directly participated the rearrangement to afford N-hydroxide.
崔世千,張香東 단국대학교 대학원 1982 學術論叢 Vol.6 No.-
Five steps of subsequent reactions: olefin, β-haloalcohol, epoxide, amino alcohol, β-haloamine and aziridne were conducted successfully. Among these reactions, amino alcohol, which were obtained by reaction of epoxide compounds with tert-butylamine and ethylamine were able to be separated quantitatively from the aqueous solution by saturating it with potassium carbonate, magnesium sulfate and sodium sulfate. The aziridine ring formation was unexpectedly difficult presumably due to the ring strain, even through proximity factor is favored for the small ring. The yield was improved by removing sulfur dioxide completely, which was generated during the chlorination prior to ring forming reaction and by using conc·potassium hydroxide during the aziridine formation.
P-Chlorobenzenecarboperoxoic Acid 合成에 관한 硏究
崔世千,尹忠三 단국대학교 1986 論文集 Vol.20 No.-
p-Chlorobenzenecarboperoxoic acid was successfully prepared from parent acid and hydrogen peroxide at room temperature. This preparation requires only a short reaction time and simple equipment. Determination of the exact p-Chlorobenzenecarboperoxoic acid content was carried out by lodometric titration. p-Chlorobenzenecarboperoxoic acid, once isolated, is stable over long periods of time when stored in polyethylene containers and refrigerated. Removal of the solvent over prolonged periods and drying of the solid peracid by excessive heating results in drastic losses of active oxygen. The yield, therefore, can be improved by removing the solvent as rapidly as possible at low temperature. p-Chlorobenzenecarboperoxoic acid is quite soluble in methylene chloride and melting point (decomposition temperature) of p-Chlorobenzenecarboperoxoic acid is slightly higher than m- Chlorobenzenecarboperoxoic acid. It will be also used as a good oxidizing agent, if the activity of this compound is improved by the further work.