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2- Thiophenyltriisopropoxytitanium 의 합성 및 카르보닐 화합물에 대한 반응성
경석헌,주현 ( Suk Hun Kyung,Hyun Joo ) 한국환경농학회 1994 한국환경농학회지 Vol.13 No.2
2-Thiophenyltriisopropoxytitanium was prepared in situ by trans-metallization of 2-thiophenyllithium and chlorotitaniumtriisopropoxide. It could be isolated at room temperature and preserved at -10°C for weeks. The reactivity of 2-thiophenyltriisopropoxytitanium to carbonyl compounds proved to be high. Complete aldehyde-selectivity was observed in competition reactions of 2-thiophenyl-triiso-propoxytitanium with a 1 : 1 mixture of aldehyde and ketone. In the competitive reaction of 2-thiophenyl-triisopropoxytitanium to ketone-ester function, ketone adduct was perfectly obtained.
입체선택적 유기합성반응을 위한 새로운 촉매 합성과 이의 응용 -Bisphosphonite-Rhodium 촉매합성-
경석헌,Kyung, Suk-Hun 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.44 No.4
새로운 형태의 촉매를 개발하기 위하여 bis(diethylamino)phosphine을 diol과 반응시켜 bisphosphonite를 합성하고, 이것을 bis(cycloocta-1,5-dienrhodium tetrarate)$[(COD)_2Rh^+BF_4\;^-]$와 반응시켜 rhodium(I)-bisphos-phonite complex를 처음으로 합성하였다. 이 유기금속화합물의 결정구조를 확인하였으며, 이들은 hydroformyl-ation반응에 효과적인 촉매로 이용될 수 있음이 밝혀졌다. The new type ligand, bisphosphonites, were easily prepared through ligand exchange reaction of bis (diethylamino)phosphine with diols. These bisphosphonites reacted with $(COD)^2Rh^+BF_4\;^-$ to corresponding bisphosphonite-rhodium(I) comlexes, of which X-ray crystallography was for the first time investigated. This organometallic compound was applicated in hydroformylation reaction as catalyst, and proved to be very effective one.
자생식물의 메탄올 추출물이 흰줄숲모기 및 바퀴에 대한 기피효과
경석헌(Suk-Hun Kyung),윤영희(Young-Hee Yoon) 한국농약과학회 2000 농약과학회지 Vol.4 No.2
Methanol extracts of nine native plants(Taraxacum platycarpum leaf, Pinus densiflora leaf, Artemisia princeps leaf, Allium tuberosum leaf, Cassia obtussifolia whole plant, Sophora angestifolia root, Stemonae sessilifolia root, Lonicera japonica stem, leaf, flower, and Clivia miniata leaf) were tested for repellent activity against Aedes albopictus and Blatella germanica. The extracts of P. densiflora, T. platycarpum, A. tuberosum and L. japonica(flower) exhibited excellent repellent activity against A. albopictus, while only L. japonica (leaf) had some good activity against B. germanica.
입체선택적 유기합성반응을 위한 새로운 촉매 합성과 이의 응용 -Bisphosphonite-Rhodium 촉매합성-
경석헌 ( Suk Hun Kyung ) 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.40 No.6
The new type ligand, bisphosphonites, were easily prepared through ligand exchange reaction of bis (diethylamino)phosphine with diols. These bisphosphonites reacted with (COD)²Rh^+BF₄^- to corresponding bisphosphonite-rhodium(I) comlexes, of which X-ray crystallography was for the first time investigated. This organometallic compound was applicated in hydroformylation reaction as catalyst, and proved to be very effective one.
약용식물로부터 오이흰가루병에 대한 항균성물질 탐색 및 동정
백수봉,경석헌,도은수,오연선,박병근 ( Su Bong Paik,Suk Hun Kyung,Eun Soo Doh,Yeon Sun Oh,Byoung Keun Park ) 한국환경농학회 1994 한국환경농학회지 Vol.13 No.3
This experiment was conducted to test the fungicidal activity of extracts from 50 medicinal plants to powdery mildew (Sphaerotheca fulinginea) and identify the bioactive substances. Among the medicinal plants tested, the water extract of Rheum undulatum was the most effective in spore germination inhibition, which inhibited by 100% at 200-fold dilution. Also, 50-fold dilution of water extract, 100-fold dilution of alcohol extract, 500-fold dilution of crude extract from Rheum undulatum and even 1000-fold dilution of reference chemical inhibited powdery mildew of cucumber more than 60%. 500-fold dilution of crude extract inhibited powdery mildew of cucumber 100% by twice spray treatment. There was phytotoxcity at the 100-fold dilution, but was not recognized this injury at the 500-fold dilution of crude extract. From our research to identify bioactive substance using HPLC, GLC and Mass spectrum analysis, it indicated that Rheum undulatum extract contained tentatively 1,8-dihydroxy-3-methyl-9,10-anthracenedione and 1,8-dihydroxy-3-methoxy-6-methyl-9,10-anthracenedione.
파프리카 추출물의 색소안정성과 Ethoxyquin 및 잔류용매 검출
이선옥,경석헌,박길동,강희곤,박주성,이시경,Lee, Seon-Ok,Kyung, Suk-Hun,Park, Kil-Dong,Kang, Hee-Gon,Park, Joo-Sung,Lee, See-Kyung 한국응용생명화학회 2002 한국농화학회지 Vol.45 No.2
올레오레진 파프리카의 색소 안정성과 ethoxyquin의 잔류량 분석을 위하여 용매별 최대 흡수파장과 흡광도, 용매와 ethoxyquin파의 잔류량 분석 조건을 비교 분석한 결과는 다음과 같다. 용매별 올레오레진 파프리카의 최대 흡수파장은 444-458 nm에서 나타났으며 흡광도 값은 에탄올에서 가장 높게 나타났고 아세톤, 클로르포름, 메탄올의 순으로 높게 나타났다. 용매별 올레오레진 파프리카 추출물에서의 색가는 에탄올, 아세톤, 클로르포름 그리고 메탄올 순으로 높았으며 국가별로는 미국 제품이 용매에 따라서 다른 나라의 제품보다 2-6배 정도가 높았다. 올레오레진 파프리카에서 잔류되는 용매는 주로 아세톤, 메탄올 그리고 헥산이 일부제품에서 미량 검출되었으며 기타의 잔류용매는 검출되지 않았다 Ethoxyquin의 분석에서 GC에 의한 분석방법으로는 다양한 분석조건에서 실시하였으나 적합하지 않았다. HPLC에 의한 ethoxyquin의 분석을 위한 올레오레진 파프리카 추출물의 용해용매로 헥산을 이용한 것이 가장 분리능이 좋았으며 검출한계는 $0.01\;mgl^{-1}$이었다. 생산국별 올레오레진 파프리카에서의 ethoxyquin 검출은 미국과 스페인 제품에서 미량 검출되었으며 ethoxyquin이 검출된 제품이 검출되지 않은 제품보다 색가가 더 높게 나타났다. Effects of ethoxyquin on the color stability of oleoresin paprika extracts and amount of residual ethoxyquin, a color stabilizer, in commercial extracts were determined. The oleoresin paprika extracts dissolved in ethanol gave the highest maximum photo-absorbency at 444-458 nm, with the color index of United States product 2-6 times higher than that produced in India. The residual solvents in oleoresin paprika extracts were mainly acetone and methanol, although some other extracts also contained small amounts of hexane. HPLC analysis was determined as a proper analytical method for residual ethoxyquin assay in the oleoresin paprika extracts, particularly when hexane was used as a solvent. The residual ethoxyquins were detected in the extracts produced in US and Spain which had relatively high color indices.
리영규,송철,경석헌,Lee, Young-Kyu,Song, Cheol,Kyung, Suk-Hun 한국응용생명화학회 2002 한국농화학회지 Vol.45 No.1
7종의 monoterpene을 이용하여 phosphate, thiophosphate 및 carbamate를 합성하고, 이들 중 유기인계 화합물의 우리나라 주요 해충인 벼멸구(Nilaparvata lugens), 복숭아혹진딧물(Myzus persicae), 배추좀나방(Plutella xylostella), 담배거세미나방(Spodoptera liyura) 및 점박이응애(Tetraychus urticae)에 대한 살충효과를 조사하였다. 그 결과 500 mg/l 농도에서 carveol과 geraniol의 thiophosphate형은 벼멸구와 배추좀나방에 대하여 매우 좋은 살충효과를 보였는데 특히 carveol의 thiophosphate는 250 mg/l 농도에서도 벼멸구에 대한 살충력은 100%였다. 한편 menthol, thymol 및 borneol의 경우는 phosphate형이 thiophosphate형보다 벼멸구와 점박이응애에 대해 높은 효과가 있는 것으로 나타났다. Seven organophosphorus compounds and three carbamates of some monoterpenoids were synthesized and tested for insecticidal activity to five insects, brown plant happer (BPH, Nilaparvata lugens), green peach aphid (GPA, Myzus persicae), diamond bark moth (DBM, Plutella xylostella), tobacco cut worm (TCW, Spodoptera litura), and two spotted spider mite (TSSM, Tetranychus urticae). With the administration of 500 mg/l concentration thiophosphates of carveol and geraniol showed motality of from 95% to 100% to BPH and DBM. On the other hand, phosphates of menthol, thymol, and borneol had also good to moderate activity to BPH and TSSM insects at the same concentration.