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α,β-불포화-δ-hydroxy sulfide 의 합성
宋錫珠,李剛烈 聖心女子大學校 1975 論文集 Vol.6 No.-
염화크로틸과 2-메르갚토 피리딘을 알카리성 에탄올에서 반응시켜 알릴설피드, 즉 2-피리딜 크로틸 설피드를 합성하였다. 이것은 부틸리튬으로 처리하여 카르반이온이 형성되었으며 이 카르반 이온을 카르보닐 화합물과 반응시켰다. 생성물은 예측하지 않은 방향으로 일어나서, β, r-불포화-β′-히드록시 설피드 대신에 α, β-불포화-δ-히드록시 설피드가 주생성물이었다. 이 반응에서 입체장애의 관계를 제시하였다. Allylsulfide, 2-pyridyl crotyl sulfide, was synthesized by reaction of crotyl chloride with 2-mercaptopyridine in alkali solution of ethanol. The sulfide was converted to carbanion by the action of n-Butul lithium. The carbanion formed is reacted with carbonyl compound, in a somewhat unexpected fashion. Instead of β, r-unsaturated-β′-hydroxy sulfide, which is expected, α, β-unsaturated-δ-hydroxy sulfide formed as main product. Steric effect was proposed for this reaction.
이강열,조용범 건국대학교 산업기술연구원 2004 건국기술연구논문지 Vol.29 No.-
This paper proposes a multicast routing algorithm based on neural networks. The multicast is a way that communicates data from one or multiple senders to the group of multiple receivers. It is suitable to provide multimedia services such as Video-Conferencing, Video on Demand, and so on. In this paper, we propose a modified Hopfield neural network to solve the QoS(Quality of Service) constrained multicast routing problem. We consider only one QoS constraint; the delay bound, which is the most important QoS parameter for the multimedia applications. The results show that the proposed algorithm can find the least cost routes from a source node to specific destinations within a delay time. It is also compared multicast routes with other existing heuristic algorithms.
구아닌 잔기중 N ²와 1-N 질소의 반응성에 대한 연구
李剛烈 聖心女子大學校 1976 論文集 Vol.7 No.-
페닐글리옥살과 N², N²-디메틸구아닌을 반응시켜 시간별로 반응생성물을 종이 크로마토그래피로 분리하였으며, 이와 대응되는 1-메틸구아노신도 같은 방법으로 페닐글리옥살과 반응시켰다. N², N²-디메틸구아닌과 페닐글리옥살은 부가생성물을 주었는데, 이 부가 생성물은 보통의 조건에서도 상당히 불안정한 화합물이었으며, 특히 용액의 pH를 염기성으로 하면 쉽게 분해되었다. 1-메틸구아노신은 페닐글리옥살과 반응하지 않았으며, 그 이유는 1번 질소가 메틸기로 막혀 있기 때문이다. 1번 위치의 질소가 N²의 아미노기보다 더 센 반응성 을 보여 주고 있음을 알았다. The reaction product was seperated by paaper chromatography from the reaction between phenylglyoxal and N², N²-Dimethylguanine. And the same experiment was carried out by using 1-Methylguanosine instead of N², N²-Dimethylguanine. The reaction between N², N²-Dimethylguanine and phenylglyoxal gave an addition product which was very unstable especially at alkaline pH. On the other hand 1-Methylguanosine had not reacted on phenylglyoxal, since the nitrogen at position I was blocked by methyl group. The nitrogen at position 1 was more reactive than amino group in 2 position.