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Benzyl Benzenesulfonate와 3次아민의 반응(反應)에 관(關)한 용매효과(溶媒效果)
려수동 ( Soo Dong Yoh ),박성식 ( Sung Sik Park ),최재환 ( Jae Hwan Choi ) 경북대학교 과학교육연구소 1981 科學敎育硏究誌 Vol.5 No.-
The rate of quaternization reaction of benzyl benzenesulfonate with t-amines such as trie-thylamine, pyridine, 3, 5-lutidineand N, N-dimethylaniline has been measured in various solven-ts by conductivity method. As a result, on the whole, in aprotic solvents reaction rate has been increased by the increase of solvent polarity. In methanol, the reason that the reaction rate is fast in contrast to dielectric constant is the "Push-Pull" type mechnism. Activation parameters and isokinetic relationship between ΔS- and ΔH indicated Sn2 re-action mechanism in each solvent. In the case of methanol, when pka of amine is very large, the reaction rate has been decr-eased beeause its nucleophilicity has been weakened by hydrogen bonding and the energy of desolvation has increased. Better correlation between solubility parameter and reaction rate was obtained.
산업체(産業體) 부설(附設) 특별학급(特?學級)(학교(學校))의 과학교육운영실태(科學?育運營實態)와 개선방안(改善方案)
려수동 ( Soo Dong Yoh ),정원우 ( Won Woo Chuang ),박종환 ( Jong Hwan Park ),김은중 ( Un Kyung Kim ) 경북대학교 과학교육연구소 1991 科學敎育硏究誌 Vol.15 No.-
In order to understand the current situation and management of science education in the spe-cial classroom(school) managed by the firms, a census on administrative functions, instruction system, experimental facilities was taken on workers attending 17 Special Classes and 9 Special Schools located in Taegu City and Kyungpook Provincial. As a result, most students chose the subject “Science” as an option within their limited 8 units credits. About 88.5% of the students were female. About 78.3% of the classes/schools were conducted in the evening only. About 59. 4% of teaching staffs were prevailed with female in these classes, and most of them were young, naive, and unexperianced with their major in chemistry and physics. Insufficient facilities and equipments, crowded classes, understaffed instructors, and inappropriated text materials, etc., were reasons for the students not receiving maximum benefit from these classes and schools. Having inadequate time to perform and complete the scientific knowledge. This census data for the current situation established a need for bettering administrative and management functions for future development in the science class instructions, and should serve as a refer-ence for the future foundation of these kinds of special classes and schools.
치환(置換) Phenacyl bromide와 Pyridine류(類)와의 반응(反應)에 관(關)한 반응속도론적(反應速度論的) 연구(硏究)
려수동 ( Soo Dong Yoh ),침광택 ( Kwang Taik Shim ),황규탁 ( Kyu Tag Howang ) 경북대학교 과학교육연구소 1978 科學敎育硏究誌 Vol.2 No.-
The rates and the acyivation parameters for the reaction of substituted phenacyl bromides with pyridines in methanol were measured. The effects of substituents on the reaction of substiuted phenacyl bromides with pyridines were discussed. The rates of reaction were increased with the electron attraction power of substituents of phencyl bromides. The isokinetic relationship was seen between Ea and ΔS≠. The exellent linear relationships, given by following equation, were observed between log kand pka of pyridines except for 4-cyanopyridine. log k=0.31 pka -2.65 in MeOH at 45℃ The Hammett o plot showed a linearity about substituents of phenacyl bromi-des and pyridines except for p-methoxy, 4-cyano groups. This deviation of 4-cyanopyrdine was considered to be attributed to the localization of π-electron on pyridine ring induced by the nuclear nitrogen atom and crano group. From the above results and the reports of Baker, Hughes, and Pearson, it was considered that this reaction was a SN2 mechanism in which nucleophile simultaneously attachks between the carbonyl group and a-carbon to form π-complex.
置換 Benzyl Arenesulfonate와 Dimethylaniline類의 反應生成物에 關한 然究
呂壽東 慶北大學校 師範大學 1975 敎育硏究誌 Vol.17 No.-
Benzyl-N, N-dimethylanilinium tosylate were synthesized from benzyl tosylate with dimethylanilne in acetone and comparative study of their physico-chemical constants were made. The salt was identified from the nmr and infrared spectral data. Substituted benzyl arenesulfonates and dimethylanilines were prepared and identified too.
呂壽東,韓仁淑,沈光澤,張萬植 경북대학교 교육대학원 1985 논문집 Vol.17 No.-
Recently, Phase Transfer Catalyzed Organic Synthesis is studied intensely. The Reactions of benzyl chloride with various alcohols (Et, n-Pr, iso-Pr, n-Bu, iso-Bu, sec-Bu, tet-Bu, Ph, Bz-OH) were investigated under Phase Trasfer Catalysis in this research. Benzyltrietylammonium chloride(B.T.E.A.C), dodecyltrietylammonium bromide(L.T.E.A.B) and tetrabutylammonium chloride(T.B.A.C) were used as Phase Transfer Catalyst. The Optimum Conditions between benzyl chloride and varios alcohols were studied in the presence of T.B.A.C which proved to be most effective among catalysts tested. Optimized conditions were as following. The molar ratio between benzyl chloride and tertiary butanol was 1:3. The amount of catalyst was 1.08mmol. And the amount of 50% NaOH aqueous solution was 7g. Under optimized conditions, it has been observed that benzyltet-alkyl ether, benzylphenyl ether and dibenzyl ether can be obtained in good yield over 80%, benzyliso-alkyl ether in about 50%, benzyln-alkyl ether only in less than 20%. The tendency of yield in various alcohols was increased Et<Pr<Bu<Bz<Ph-OH. And the tendency of yield in isomeric alcohols was increased primary<secondary<tertiary alcohol.