http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
윤웅찬,차진기,정동윤 부산대학교 1989 자연과학논문집 Vol.48 No.-
Peseudosaccharyl benzyl thioether (14)는 광화학 반응성이 비교적 커서 메탄을 용매 내에서 probenazol (1)의 경우와 비슷하게 결합절단 "a" 균형 분해와 메탄을 용매의 광화학적 진해성 치환반응을 통하여 4가지 생성물 N-benzyl thiosaccharin (20), thiosaccharin (21), N-(p-tolyl)-thiosaccharin (22)과 pseudosaccharyl methyl ether (2)를 생성 시켰으며, 결합 "a"절단에 의하여 생성되는 20, 21, 22의 총수율이 광화학적 친핵성 치환반응에 의하여 생성되는 2의 수율보다 약 4배 가량 많다. Pseudosaccharyl benzyl thioether (14)를 산소기류하에서 반응시킨 결과 동일한 4가지의 생성물에 관찰되는 것으로 보아 반응상태는 일중상태임이 확실시 된다. Photochemical reaction of pseudosaccharyl thioethers were studied. Pseudosaccharyl benzyl thioether in methanol underwent a photochemical transformation via homolytic cleavage of the bond between sulfur and benzyl carbon (bond "a" cleavage) and photochemical nucleophilic subsitution reaction at C-3 of pseudosaccharyl moiety by a solvent molecule, methanol. N-(3-benzyl)-thiosaccharin and N-(p-tolyl)-thiosaccharin were isolated by silica gel chromatography from the photolysate of pseudosaccharyl benzyl thioether and their structures were determined by spectral methods. The inability of oxygen to quench the bond "a" clevage during the photochemical reaction indicates that the reaction goes through a singlet a singlet state. The photochemical reaction of two pseudosaccharyl alkyl thioethers (-propyl thioether, -isopropyl thioether) have been studied in methanol. Both of these two pseudosaccharyl alkyl thioethers produced pseudosaccharyl methyl ether and another product which does not seem to arise from the homolytic cleavage.
Pseudosaccharin Pyridinemethyl Ether들의 광화학반응
윤웅찬,김정희,이상진,김현진,오선화,박원우,Yoon, Ung Chan,Kim, Jeong Hie,Lee, Sang Jin,Kim, Hyun Jin,Oh, Sun Wha,Park, Won Woo 대한화학회 1997 대한화학회지 Vol.41 No.12
Pseudosaccharin pyridinemethyl ether들의 광화학반응을 검토하였다. Pseudosaccharin 2-pyridinemethyl ether, pseudosaccharin 4-pyridinemethyl ether, pseudosaccharin 3-pyridinemethyl ether 모두 빛조사에 의해 신속히 반응하였으며 반응은 pseudosaccharyl 산소원자와 pyridinemethyl 탄소원자 사이의 결합 균형분해과정과 용매로 사용한 메탄올에 의한 pyridinemethoxy기의 들뜬상태 친핵성 치환과정을 거쳐 진행됨을 관찰하였다. 이들 두 과정은 반응용액 중에 존재하는 산소분자에 의해 소멸되지 않았다. 광생성물 수율로 볼 때 결합균형분해과정이 들뜬상태 친핵성 치환과정 보다 우세함을 알았다. Photoreactions of pseudosaccharin pyridinemethyl ethers have been investigated. Pseudosaccharin 2-pyridinemethyl ether, pseudosaccharin 4-pyridinemethyl ether and pseudosaccharin 3-pyridinemethyl ether all undergo a facile photoreaction via reaction pathways involving homolysis of the bond between pseudosaccharyl oxygen and pyridinemethyl carbon, and excited nucleophilic substitution of pyridinemethoxy group by solvent, methanol which are not quenched by oxygen present in the reaction. Product yield demonstrates that the homolysis pathway predominates over the nucleophilic substitution.
윤웅찬,최정희,진성호,송동미,Yoon, Ung-Chan,Choi, Jung-Hei,Jin, Sung-Ho,Song, Dong-Mi 한국광과학회 2005 Journal of Photosciences Vol.12 No.1
We synthesized chiral choleseric liquid crystalline monomer p-phenylene bis-(p-3-acryloxy-2(S)-methylpropoxy)benzoate (1) and achiral nematic liquid crystalline monomer, p-phenylene p-acryloxy-6-hexyloxy-p-octyloxybenzoate (2) for the construction of cholesteric polymer network with a pitch gradient. In this research we attempted to synthesize cholesteric polymer film which have a wide reflection bandwidth in the region of visible wavelength with the synthesized chiral cholesteric monomer 1 and nematic monomer 2 under various photopoly merization conditions. We succeeded to construct cholesteric polymer film network with a pitch gradient covering more than 200 nm bandwidth in the visible wavelength by diffusion controlled photostructuring method.
윤웅찬,김정희,김진억,김정균,박노상 부산대학교 1985 자연과학논문집 Vol.40 No.-
Photochemical reactions of three pseudosaccharin-pyridinemethylethers were studied. Pseudosaccharin-2-pyridinemethylether(6), pseudosaccharin-4-pyridine methylether(7) and  ̄  ̄ pseudosaccharin-3-pyridinemethylether(8) underwent similar photochemical transformation to  ̄ that of pseudosaccharin-3-allylether (probenazole) via homolytic cleavages of bonds between oxygen and pyridine-methylcarbon. (bond "a" cleavage) and between pyridine carbon and pyridinemethylcarbon (bond "b" cleavage). Bond "a" cleavages were at least 13 times more efficient than bond "b" cleavages in all cases probably due to te greater stability of saccharin radical and pyridinemethyl radical formed through bond "a" cleavage than radicals formed through bond "b" cleavage. N-(2-pyridinemethyl)-saccharin, N-(4-pyridinemethyl)-saccharin, or n-(3-pyridinemethyl)-saccharin was isolated by silica gel chromatography from the photochemical reaction of 6~8 respectively as a major product and their structures were  ̄ ̄ determined by spectral methods. In addition, saccharin and pseudosaccharin-methylether were also found to be formed in the photochemical reaction of 6~8. The inability of oxygen  ̄ ̄ during their photochemical reactions to quench bond "a" and "b" cleavage revealed that the reactive that the reactive state in the photochemical reaction of 6~8 is a single state.  ̄ ̄
Atmospheric Ozone Concentrations in the Industrial and Traffic Areas of Pusan City
Yoon,Ung Chan,Yun,Il,Kim,Jack C.,Kim,Jong-myung,Kim,Min-sook 부산대학교 환경문제연구소 1984 環境硏究報 Vol.2 No.-
부산 시청, 연산동, 감전동, 부산진구 및 명륜동 등의 5개지역에서 Ozone분석기를 이용하여 대기 중의 오존 농도를 측정한 수치는 다음과 같다(괄호 안은 최대치). 0.014(0.062), 0.031(0.230), 0.041(0.121), 0.021(0.081) 및 0.023ppm(0.091ppm). 가장 낮은 0.014ppm의 부산 시청 주위 농도는 인접한 바다 바람에 의한 희석 때문이라고 생각되며, 공업지역의 감전동의 0.041ppm은 대기중의 배기가스에 기인된 것이라 사료된다. 5개 지역의 오존 최대치가 미국의 기준치(0.08ppm) 및 일본의 0.06ppm을 초과하는 농도이다. 인간의 보건, 식물 및 유기고분자에 미치는 영향을 평가하였다.