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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.
3-Phenyl-1-(2-furyl)propenone유도체의 가수분해 반응 메카니즘의 반응속도론적 연구
맹주양,한찬수 순천향대학교 1994 논문집 Vol.17 No.3
Five 3-phenyl-l-(2-furyl)propenone derivatives were prepared by the condensation reactions of acetylfuran with benzaldehyde derivatives. The rate constants for hydrolysis of 3-phenyl-l-(2-furyl) propenone derivatives were determined at various pH in 50% MeOH-water mixed solvents at 25℃ (u=0. 1 NaCl). From the observed rate constants, rate equations, isosbestic points, general base effect, substituent effect and product analysis, the reasonable mechanism was proposed. From the results, the reaction mechanism was proposed 1,4-Michael type addition reaction of a, b-unsaturated ketones with water. Below pH8.0, water added to the carbon-carbon double bond of 3-phenyl-l-(2-furyl) propenone derivatives. At pH 8.0-12.0, water molecules and hydroxide ion added competitively to carbon-carbon double bond of 3-phenyl-l-(2-furyl) propenone. Above pH12, hydroxde ion added to the carbon-carbon double bond of 3-phenyl-l-(2-furyl) propenone.
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.
2-Cinnamoylthiophene에 대한 Cysteine의 반응 Mechanism에 관한 연구
맹주양,鄭昌雄,張聖根 순천향 대학교 1984 논문집 Vol.7 No.2
The kinetics and mechanism of nucleophilic addition of L-Cysteine to 2-Cinnamoylthiophene over wide pH range were presented and analyzed in detail. The rate constants were determined with UV-spectrophotometer in 50% methanol-water solvent at 25℃. The rate equation which can be applid to over wide pH range was obtained k=?? Anaysis of rate constants suggests that below pH 10, the reaction is initiated by the attack of cysteine molecule, and above pH 12.5, deprotonated cysteine ion attack the molecule.
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
맹주양 외 순천향대학교 기초과학연구소 2011 순천향자연과학연구 논문집 Vol.17 No.2
In this paper, for analysis Dried chinese matrimony vine at domestically-grown samples for pesticide residues simultaneous were used by multicomponent analysis and GC / ECD. To analyze pesticides are Chlorothalonil, Pyridaphenthion, Azoxystrobin, Fluazinam, Propineb, Chlorfenapyr and Dinotefuran as written standards for the calibration curve after each sample were analyzed on the qualitative and quantitative. Regions are common in samples in Pyridaphenthion, Chlorothalonil, Azoxystrobin, Propineb, and Dinotefuran were not detected but the two pesticides(Fluazinam and Chlorfenapyr) were detected. ◁표 삽입▷(원문을 참조하세요) When the pesticide is detected as shown in the above table, Chlorfenapyr allowance does not go beyond the limits the Dried chinese matrimony vine hit 2.0ppm, Chlorfenapyr for all classified into five regions goods acceptance and Fluazinam was not detected the remaining four regions of the detected in terms of replacing, to replace the hit is detected the acceptance criteria across the 0.3ppm are classified throw-out.
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.