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GC/NPD를 이용한 방울토마토에서 잔류농약 Fenitrothion의 세척방법에 따른 제거 효과 분석
맹주양,황태선,최승호,중수연,박선희,김태현 순천향대학교 기초과학연구소 2013 순천향자연과학연구 논문집 Vol.19 No.2
This study was investigated the removal rate of residual fenitrothion in cherry tomato with some washing methods when fenitrothion was sprayed to cherry tomato. Using baking-soda solution as washing solution, fenitrothion was removed 39.9 % within 5minute, however removal rate was reduce to 8.8% with 10 minute washing. AS 0.2% detergent in ultrasonic washing, removal rate was 37.0% within 5 minute and 37.7 % in 10 minute washing. These results suggest that the removal of fenitrothion was independent on some washing methods in cherry tomato.
활성화된 nickel 금속과 halobenzene의 dehalogenative coupling 반응에 관한 연구
맹주양,맹용민 순천향대학교 기초과학연구소 2001 순천향자연과학연구 논문집 Vol.7 No.2
Activated Methallic nickel powder, prepared by the reduction of nickel halides with lithium and with naphthalene as an eletron carrier, is a simple and a convenient reagent for the dehalogenative coupling of iodobenzenes and bromobenzenes under mild conditions. The intermediates, ArNiX and Ar2Ni species (Ar = C_6F_5). were isolated as the phosphine complexes.
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
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.
활성화된 환원성 Calcium을 이용한 Alloocimene에서 2-(2-methyl-1-propenyl)-6,7-dimethylcycloheptene의 합성
맹주양 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.1
Highly reactive calcium was prepared by lithium biphenylide reduction of calcium iodide in tetrahydrofuran at room temperature. This activated calcium reacts with alloocimene to yield corresponding 2,6-dimethyl-2,5-octadiene-4,7-diylcalcium complexes, these bis-organocalcium reagents can undergo dialkylation reaction with to form corresponding 7-membered ring compound (2-(2-methyl-1-propenyl)-6,7-dimethylcycloheptene).
활성화된 금속 Calcium을 이용한 Biphenyl유도체의 합성
맹주양 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.2
Highly reactive calcium was prepared by lithium biphenylide reduction of calcium iodide in tetrahydrofuran at room temperature. This activated calcium reacts with bromobezene to yield corresponding phehylbromocalcium complexe. These organocalcium reagents can undergo uncleophilic aromatic couping reaction with to form corresponding biphenyl derivatives (4-phenyltolune, 4-phenylanisole).
3-Phenyl-1-(2-furyl)propenone 유도체와 Thiophenol의 반응메카니즘 연구
맹주양 순천향대학교 1993 논문집 Vol.16 No.3
New nucleophilic adducts (3-Pheny-1-(2-furyl)-3thiophenylpropanone derivatives) were prepared by the reaction of 3-phenyl-1-(2-furly) propenone dertivatives and thiophenol. The kinetics of mucleophilic addition reactions of thiophenol solution ar 25℃. The sturcture of 3-Pheny-1-(2-furyl)-3thiophenylpropanone derivatives were ascertained by means of ultraviolet, infrared, mass and proton magnetic resonance spectroscopy and elemental analysis. The rate constants of nucleophilic addition reaction of thiophenol to 3-phenyl-1-(2-furly)propenone derivatives (p-H, p-CH₃, ρ-Cl and p-NO₂)were dertermined by ultraviolet spectrophotometery. The rate equations which can be applied over a wide pH range were obtained. From the results of the substituent effect(ρ=0.91 at pH=5.00, ρ=0.70 at pH=10.00), general base catalysis and nucleophilic addition rate equations, the rational addition mechanism was proposed ; below pH 7.0, thiophenol added to the double bond of 3-phenyl-1-(2-furyl)propenone, above pH 9.0 sulfide anion of thiophenol added to the double bond of 3-phenyl-1-(2-furly) propenone, at pH 7.0~9.0, the addition of a thiophenol and thiophenoxide anion occur competitively.