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p-Nitrostyrylphenylsulfone에 대한 Hydrogen azide의 친핵성 첨가반응 메카니즘에 관한 반응속도론적 연구
孟柱랑,權奇星 순천향의과대학 1979 Journal of Soonchunhyang Medical Science Vol.2 No.4
The reaction of p-nitrostylphenylsulfone with hydrogen azide which form the corresponding azide adducts were kinetically studied in 50% methanol. Analysis of rate constants suggest that below pH 10, the nucleophilic addition reaction of hydrogen azide to p-nitrostyrylphenylsulfone is initiated by the attack of hydrogen azide molecule on the activated carbon-carbon double bond, and above pH 12, azide ion is the only nudeophile to p-nitrostyrylphenylsulfone.
활성화된 환원성 Magnesium을 이용한 Diphenylpropenone의 반응 연구
맹주양 순천향대학교 기초과학연구소 1996 순천향자연과학연구 논문집 Vol.2 No.2
Activated highly reactive magnesium is readily prepared by the reduction of anhydrous magnesium chloride in tetrahydrofuran with lithium using naphthalene as an electron carrier. The magnesium reacts with alkylhalide(benzylchloride) to give the corresponding Grignard-type reagents in tetrahyrofuran at room temperature. Reactions of organomagnesium compounds with DiPhenylpropenone form 1,4-Michael adducts. Diphenylpropenone was prepared by the Weygand-Strobelt condensation reactions of acetophenone with benzaldehyde. Reactions of α,β-unsaturated ketone(diphenylpropenone) with activated highly reactive magnesium gave 1,4-Michael adducts
4-Nitrostyrylphenylsulfone의 加水分解反應 메카니즘과 그의 反應速度論的 硏究
맹주양,권기성 순천향의과대학 1979 Journal of Soonchunhyang Medical Science Vol.2 No.1
The rate constants for the hydrolysis of 4-Nitrostyryl-phenylsulfone were determined by UV spectrophotometer in 50% methanol-water at 29℃ and a rate equation which can be applied overwide pH range was obtained. From this equation, we may conclude the following; above pH 12, the over-all rate is only dependent on the concentration of hydroxide ion and below pH 9.5, the reaction is initiated by the attack of a water molcule on the activated carbon-carbon double bond. In the range of pH from 9.5 to 12, these two reactions occur competitively.
활성화 니켈을 이용한 Aryl chloride의 짝지음 반응에 관한 연구
맹주양,김정주 순천향대학교 기초과학연구소 2002 순천향자연과학연구 논문집 Vol.8 No.1
An efficient synthesis of biaryls(diarenes) from aryl chlorides has been developed and investigated. The coupling reagent is a catalytic mixture of anhydrous nickel salt and triphenylphosphine in the presence of a reducing metal(Mn, Ca, Na, Fe, Na). The reaction occurs rapidly under mild conditions, employs air-stable starting meterials, and can be run conveniently in ordinary laboratory glassware. Excess reducing metal drives the coupling procress and allows even aryl chlorides to be coupled to high yields
활성화된 마그네슘을 이용한 Michael 반응에 관한 연구
맹주양,김명희,강현구 순천향대학교 기초과학연구소 2000 순천향자연과학연구 논문집 Vol.6 No.1
The Most powerful tools in the synthetic organic chemists arsenal are organometallic compounds and metal mediated transformations. We reported a general approach for highly reactive metal powder by reducing metal salt in tetrahydrofuran solvents using lithium as reducing agents. Organometallic compound was generated by reaction of metal powder with organo compounds and then it was reacted with α ,β -unsaturated ketone. We synthesized 3-(4-chlorophenyl ) -1- (2-thienyl)ethylpropenoate, ethyl- (2-cyano) -3- (thienyl ) -propenoate and ethyl-(2-cyano)-3-(4-chlorophienyl)-propenoate, which are α , β -unsaturated ketone derivations. Magnesium chloride react with Li+Naph-r to give activated magnesium. The synthesized activated magnesium metal reacted with sec-Butylmagnesium chloride and n-Butylmagnesium bromide to give alkyl magnesiumhalide. The active amyl magnesium derivation reacted with the synthesized α , β-unsatruated ketone to give product.
맹주양,채민경 순천향대학교 기초과학연구소 2000 순천향자연과학연구 논문집 Vol.6 No.1
The formation of novel organometallic compounds by the reaction of organic substrates with finely divided metal powders represents a powerful tool for the synthetic chemistry. The direct reaction with a zerovalent metal is the only viable method of synthesis for many of these compounds. Accordingly, chemists have been activity developing new methods for increasing the reactivity of metal powders toward organic substrates. Three principal approaches have been developed in recent years: the metal vaporization method, sonochemistry, and the preparation of finely divided metal powders by the reduction of metal salts. A number of new methods of synthesis have resulted from these studies. The preparation of highly reactive magnesium metal by alkali metal reduction of magnesium salts has previously been reproted. So we prepared highly reactive metal powders and Grignard reagent formation using highly reactive magnesium metal has generally been limited to alkyl halides.(sec-butyl chloride, n-butyl bromide, n-butyl iodide) and we prepared α ,β -unsaturated ketone having cyano-, ester- groups. Reaction of Grignard reagents which contained alkyl halide with α ,β -unsaturated ketones prepared 3˚ -alcohol.
Ethyl-α-cyano-β-phenylacrylate 의 가수분해 반응에 관한 연구
孟柱煬,李龍九,權奇星 순천향대학교 1986 논문집 Vol.9 No.1
Four kinds of Ethyl-α-cyano-β-phenylacrylate were prepared. The rate constants for the hydrolysis of the derivatives at various pH were determined by ultraviolet spectrophotometry in 50%-50% methanol-water buffer solution at 25˚C, and the rate equations which can be applied over wide pH ranges were obtained. The sustitution effect has shown that the rate of hydrolysis was accelerated by electron-withdrawing groups. The results of the rate equations, the substitution effect and the general base catalyst effect rationalized mechanism of the hydrolysis of Ethyl-α-cyano-β-phenylacrylate derivatives.
기체크로마토그래피를 이용한 산양삼,백삼,홍삼중의 농약잔류 분석
맹주양;이용구;이숙재;정진아;김정미;김선화;김송아 순천향대학교 기초과학연구소 2010 순천향자연과학연구 논문집 Vol.16 No.2
Commercial Korean ginseng-Ginseng cultivated in mountains(GCM), White Ginseng (WG), and Red Ginseng (RG) - were used, respectively, to analyze the pesticide residues in them. The selected pesticides for the analysis of residue were procymidone and tolclofos-methyl. Procymidone residue was no detected in all of them and tolclofos-methy residue was shown as follows: RG(0.270ppm)>GCM(0.0541ppm)>WG(0.007ppm).
3-Phenyl-1-(2-furyl)-3-thiophenylpropanone 유도체의 합성
맹주양,황일선 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.2
3-phenyl-1-(2-furyl)-3-thiophenylpropanone derivatives were prepared by the reaction of benzaldehyde derivatives with 2-acetylfuran. New nucleophilic adducts (3-phenyl-1-(2-furyl)-3-thiophenylpropanone derivatives) obtained from addition reaction of 3-phenyl-1-(2-furyl) propenone and thiophnol. The structure of these compounds were ascertained by means of ultraviolet, infrared, mass and proton magnetic resonance spectra, and elemntal analysis method. These nucleophilic adducts (3-phenyl-1-(2-furyl)-3-thiophenylpropanone derivatives) are expected to play an important role against biological activation.
맹주양,정병률,손지환,채민경 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.2
The Most powerful tools in the snthetic organic chemists arsenal are organometallic compounds and metal mediated transformations. Organometallic reagent has its own characteristic chemo, regio, or strereoselectivity. We reported a general approch for highly reactive meatl powder by reducing metal salt in tetrahydrofuran solvents using lithium as reducing agents. The metal salt to reduced must be partially soluble in the solvent and reductions are carried out under an argon atomosphrer. The reductions are exothermic and generally are complete within a few hours. The reductions generated a Finely divided black powder. particle size analyses indicate a range og sizes from one to two microns to submicron range depending on the metal and, more importantly, on the method of preparation. It should be pointed out that particle size analyses as wellas surface area stuies have been done the metals that been collected, dried, and analysis. Scanning electron microscopy(SEM) photographs reveal a range frommaterial to polycrysalline metals.