http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김호식,곽삼탁,Kim, Ho Sik,Kwag, Sam Tag 대한화학회 2000 대한화학회지 Vol.44 No.3
6-Chloro-2-hydrazinoquinoxaline4-oxide(10)를 아세틸아세톤 또는 디벤조일메탄과 반응시켜 분자내 고리화반응에 의한 6-chloro-2-(3,5-disubstituted pyrazol-1-yl) quinoxaline 4-oxide류(11)를 합성하였다. 화합물 11을 phosphoryl chloride로 염소와 반응시켜 3,6-dichloro-2-(3,5-disubstituted pyrazol-1-yl)quino-xaline류(12)를 합성한 다음 hydrazine hydrate 반응시켜 6-chloro-3-hydrazino-2-(3,5-disubstituted pyrazol-1-yl)quinoxaline류(13)를 합성하였다. 화합물 13을 치환 벤즈알데히드류, benzenesulfonyl chloride, 치환 benzoyl chloride류 및 acyl chlorid 류와 반응시켜 새로운 pyrazolylquinoxaline류(14-17)를 각각 합성하였다. The reaction of 6-chloro-2-hydrazinoquinoxaline 4.oxide(10) with acetylacetone or dibenzoylmethane gave 6-chloro-2-(3,5-disubstituted pyrazol-1-yl)quinoxaline 4-oxides (11) through the intramolecular·cyclization.The chlorination of compound 11 with phosphoryl chloride afforded 3,6-dichloro-2-(3,5-disubstituted pyrazol-1-yl)quinoxalines (12), whose reaction with hydrazine hydrate provided 6-chloro-3-hydrazinodehydes, benzenesulfonyl chloride, substituted benzoyl chlohdes or acyl chlorides gave novel pyrazolylquinoxalines (14-17).
Quinoxaline 고리를 가진 Pyrazole류 및 N-Phenylethanamide류의 합성과 토토머화 현상
김호식,최경옥,이형철,곽삼탁,Kim, Ho Sik,Choi, Kyung Ok,Lee, Hyong Choul,Kwag, Sam Tag,Yoshihisa Kurasawa 대한화학회 2001 대한화학회지 Vol.45 No.5
3-Methoxycarbonylmethylene-2-oxo-1,2,3,4-tetrahydroquinoxaline(7)을 hydrazine hydrate와 반응시켜 3-hydrazinocarbonylmethylene-2-oxo-1,2,3,4-tetrahydroquinoxaline(8)을 합성하였다. 화합물 8을 alkyl (ethoxymethylene)cyanoacetate류와 반응시켜 [(quinoxalin-2-ylidene)ethanoyl]-1H-pyrazole류(9)를 합성하였고, 화합물 9b를 N-alkylaniline류와 반응시켜 N-alkyl-(quinoxalin-2-ylidene)-N-phenylethanamide류(10)를 합성하였다. 얻어진 화합물 9, 10은 용액에서 enamine 형과 methylene imine 형 사이에 토토머화 현상을 나타내었는데, 이들의 토토머비를 $^1H$ NMR 로서 측정하였다. The reaction of 3-methoxycarbonylmethylene-2-oxo-1,2,3,4-tetrahydroquinoxaline(7) with hydrazine hydrate gave 3-hydrazinocarbonylmethylene-2-oxo-1,2,3,4-tetrahydroquinoxaline(8). The reaction of compound 8 with alkyl (ethoxymethylene)cyanoacetates gave the [(quinoxalin-2-ylidene)ethanoyl]-1H-pyra-zoles(9). The reaction of compound 9b with N-alkylanilines provided the N-alkyl-(quinoxalin-2-ylidene)-N-phenylethanamides(10). Compounds 9 and 10 showed the tautomerism between the enamine and methylene imine forms in solution. The tautomer ratios were determined by the $^1H$ NMR.
2-(Pyrazol-1-yl)quinoxaline류 및 2,3-Di(pyrazol-1-yl)quinoxaline류의 합성
김호식,정원영,최경옥,이성욱,곽삼탁,이만길,Kim, Ho-Sik,Jeong, Won-Young,Choi, Kyung-Ok,Lee, Seong-Uk,Kwag, Sam-Tag,Lee, Man-Kil 대한화학회 2002 대한화학회지 Vol.46 No.1
3,6-Dichloro-2-(3,5-dimethylpyrazol-1-yl)quinoxaline(8)또는 6-chloro-3-hydrazino-2-(3,5-dimethylpyrazol-1-yl)quinoxaline(9)을 치환 아닐린류, 슬파제 및 heteroacyl chloride류와 반응시켜 2-(pyrazol-1-yl)quinoxaline류(10-12)를 합성하였다. 그리고 화합물 9를 alkyl (ethoxymethylene)cyanoacetate류와 반응시켜 분자내 고리화반응에 의하여 2,3-di(pyrazol-1-yl)quinoxaline류(13)를 합성하였다. The reaction of 3,6-dichloro-2-(3,5-dimethylpyrazol-1-yl)quinoxaline(8) or 6-chloro-3-hydrazino-2-(3,5-dimethylpyrazol-1-yl)quinoxaline(9) with substituted anilines, sulfa drugs and heteroacyl chlorides gave 2-(pyrazol-1-yl)quinoxalines(10-12). The reaction of compound 9 with alkyl (ethoxymeth-ylene) cyanoacetates resulted in the intramolecular cyclization to give 2,3-di(pyrazol-1-yl)quinoxalines(13).
비크롬계 인산-과망간산 용액을 이용한 AZ31 마그네슘 합금의 산처리에 따른 화성 피막의 특성 평가
김명환(Myung-Hwan Kim),곽삼탁(Sam-Tag Kwag),문명준(Myung-Jun Moon) 한국표면공학회 2010 한국표면공학회지 Vol.43 No.2
A chromium-free conversion coating for AZ31 magnesium alloy has been obtained by using a permanganatephosphate solution, which has been developed with acid pickling. Examination have been carried out on the conversion coatings for morphology, composition and corrosion resistance. The morphology of the conversion-coated layer was observed using optical microscope and SEM. It was shown that the conversion coatings are relatively uniform and continuous, with thickness 1.8 to 2.7 μm. The chemical composition of conversion coating was mainly consisted of Mg, O, P, K, Al and Mn by EDS analysis. It was found that the corrosion resistance of the AZ31 magnesium alloy has been improved by the permanganate-phosphate conversion treatment from electrochemical polarization.
크롬 프리 세륨 용액에 의한 AZ31 마그네슘 합금의 화성 피막에 대한 특성 평가
김명환(Myung Hwan Kim),이동욱(Dong Uk Lee),곽삼탁(Sam-Tag Kwag),문명준(Myung-Jun Moon) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.1
A chromium-free Ce-based conversion coating formed by immersion in a solution containing cerium chloride and nitric acid on AZ31 magnesium alloy has been studied. The effects of acid pickling on the morphology and the corrosion resistance of the cerium conversion coating were investigated. The corrosion resistance of the conversion coating prepared on AZ31 Mg alloy after organic acid pickling was better than that of inorganic acid pickling. The morphology of the conversion-coated layer was observed using optical microscope and SEM. Results show that the conversion coatings are relatively uniform and continuous, with thickness 1.0 to 1.1 μm. The main elements of the conversion coating of AZ31 Mg alloy are Mg, O, Al, Ce and Zn by EDS analysis. The electrochemical polarization results showed that the Ce-based conversion coating could reduce the corrosion activity of the AZ31 Mg alloy substrates in the presence of chloride ions.
알카리성 인산-과망간산 용액을 이용한 AZ31 마그네슘 합금의 친환경 화성 처리 및 화성 피막의 특성 평가
김명환(Myung-Hwan Kim),이만식(Man-Sig Lee),곽삼탁(Sam-Tag Kwag),문명준(Myung-Jun Moon) 한국표면공학회 2011 한국표면공학회지 Vol.44 No.3
A uniform chromium-free conversion coating treated with an alkaline phosphate- permanganate solution was formed on the AZ 31 magnesium alloy. The effect of acid pickling on the morphology and on the corrosion resistance of the alkaline phosphate-permanganate conversion coating was investigated. The chemical composition and phase structure of conversion coating layer were determined via optical microscopy, SEM, EDS, XPS and XRD. Results show that the conversion coatings are relatively uniform and continuous, with thickness 1.8 to 2.4 ㎛. The alkaline phosphate-permanganate conversion coating was mainly composed of elements Mg, O, P, Al and Mn. The conversion-coated layers were stable compounds of magnesium oxide and spinel (MgAl₂O₄). These compounds were excellent inhibitors to corrosion. The electrochemical corrosion behaviors of coatings in 3.5 wt.% NaCl solutions were evaluated by electrochemical impedance spectroscopy, potentiodynamic polarization technique. EIS results showed a polarization resistance of 0.1 kΩ for the untreated Mg and 16 kΩ for the alkaline phosphate-permanganate conversion treatment sample, giving an improvement of about 160 times. The results of the electrochemical measurements demonstrated that the corrosion resistance of the AZ 31 magnesium alloy was improved by the alkaline phosphate-permanganate conversion treatment.
에폭시와 아크릴 전착도료의 혼용성에 따른 물성 변화 연구
정성수(Sung Soo Jung),이동욱(Dong Uk Yi),김동원(Dong Won Kim),김명환(Myung Hwan Kim),곽삼탁(Sam Tag Kwag),문명준(Myung Jun Moon) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.3
The important drawback of epoxy electrodeposition(ED) coatings is the lack of the weathering resistance caused by the structure of bisphenol A. To improve this yellowing phenomena, acryl ED coatings have been developed. Compared with the epoxy ED coatings, however, acryl ED coatings are relatively weak in the corrosion resistance and mechanical properties. The purpose of this study is complemented their drawbacks by mixing epoxy and acryl ED paints. The salt spray, accelerated weathering test(QUV) and cupping, bending, impact test were employed to investigate the corrosion resistance, weathering resistance, and mechanical properties of ED coatings. When the ratio of acryl to epoxy resin of ED coating is 0.33, the weathering resistances are appropriately improved in condition maintaining the corrosion resistance. It was shown that the weathering resistance for epoxy ED coating was adjusted by optimally mixing acryl ED paint.
李東鎭,郭三鐸 慶一大學校 1996 論文集 Vol.13 No.2
We have synthesized Pd catalyst by the modified method to accomplished a metal plating on ABS resin. The catalyst was produced to dimer complex, [(Et)₄N]₂[Pd₂Cl₂(SnCl₃)₄] which contain bridge ligand, Cl ?? , between palladium metals, and identified by the spectriscopic method. In the reaction between catalyst and acrylonitrile, the air sensitive monomer with acrylonitrile was produced through the bond breaking of bridge ligand. Applying these results to metal plating process, it seems that the reaction mechanism could be suggested which palladium-tin catalyst was coordinated on ABS resin, and then a succession of reaction, eg, ligand migration, coupling between ligands, and inner sphere electron transfer reaction occured.