• Bulletin of the Korean Chemical Society
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• 제14권1호
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• pp.79-81
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• 1993

Synthetic routes are described for the introduction of hydroxyalkyl groups to the upper rim of calix[4]arene. Treatment of p-bromocalix[4]arene methyl ether 3 with n-BuLi followed by para-formaldehyde produced p-hydroxymethylcalix[4]arene methyl ether 4 in 60% yield. p-Acetylcalix[4]arene methyl ether 7, obtained by Friedel-Crafts acetylation of calix[4]arene methyl ether 6, was reduced with NaBH4 to produce p-(1-hydroxy ethyl)calix[4]arene methyl ether 8 in 67% yield.

• Natural Product Sciences
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• 제4권4호
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• pp.245-252
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• 1998

The unique sulphated phenolics, gallic acid 3-methyl ether 5-potassium sulphate, isoferulic acid 3-potassium sulphate, and ellagic acid 4,4'-dimethyl ether 3-potassium sulphate have been isolated from the flowers of Tamarix amplexicaulis Ehrenb. (Tamaricaceae). The hitherto unknown natural phenolic acid, gallic acid 3-methyl ether, together with the known phenolic, gallic acid, gallic acid 4-methyl ether, isoferulic acid, ferulic acid, ellagic acid, and ellagic acid 4,4'-dimethyl ether have been also separated and characterized. The structures were established by conventional methods, including electrophoretic analysis and confirmed by ESI-MS, $^1H-\;and\;^{13}C-NMR$.

• 한국응용과학기술학회지
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• 제26권3호
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• pp.306-316
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• 2009

In this study, block copolymer of polystyrene and polyethylene glycol methyl ether methacrylate(PEGMA) by ATRP(atom transfer radical polymerization) method was synthesized. 4 arm-molecule which contained halogen atom was synthesized for an initiator. With 4 arm-molecule monodispered polystyrene were synthesized by ATRP method. The molecular change of synthesized monodispersed polystyrene with respect to time was investigated and living polymer characteristic was confirmed. Block copolymer of polystyrene and polyethylene glycol methyl ether methacrylate(PEGMA) was synthesized by ATRP with macroinitiator which was synthesized from the monodispersed polystyrene(Mn=12000). The molecular weight of obtained PS-b-PEGMA was 22,000.

• 멤브레인
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• 제25권6호
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• pp.515-523
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• 2015

상업적으로 이용되는 폴리스티렌계 이온교환막은 제조 공정이 쉽고 간단하지만 막이 가지는 취성 때문에 내구성이 약하다는 단점을 가지고 있다. 이를 보완하기 위하여 친수성 그룹인 poly(ethylene glycol)을 곁사슬로 가지고 있는 poly(ethylene glycol)methyl ether methacrylate를 공중합시켜 음이온 교환막을 합성하였다. 지지체로는 내화학성 및 기계적 강도가 우수한 다공성 PE 지지체를 사용하였고, 여기에 다양한 조성의 vinylbenzyl chloride, styrene, poly(ethylene glycol)methyl ether methacrylate, divinylbenzene, benzoyl peroxide를 녹인 단량체 용액을 지지체 기공에 채운 뒤 열중합 가교시켜 trimethylamine을 이용하여 음이온 교환기를 도입해 세공충전 음이온 교환막을 합성하였다. 또한 poly(ethylene glycol)methyl ether methacrylate의 곁사슬 길이와 각 단량체가 차지하는 비율의 변화가 음이온 교환막의 전기화학적 특성에 미치는 영향을 알아보았다.

• Archives of Pharmacal Research
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• 제28권11호
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• pp.1233-1235
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• 2005

Two new biflavonoids, 3'-hydroxyamentoflavone-7-O-methyl ether (1) and 3'-hydroxyamentoflavone (2), were isolated from the fruits of Aristolochia contorta Bge. Their structures were elucidated by HR-ESI-MS, 1D-, and 2D-NMR spectroscopy.

• Archives of Pharmacal Research
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• 제21권3호
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• pp.357-360
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• 1998

Two new 4-hydroxybenzyl alcohol derivatives (1 and 2) were isolated from the methanol extract obtained from fresh tubers of Gastrodia elata together with 4-hydroxybenzyl methyl ether, 4-hydroxybenzyl alcoho, bis(4-hydroxyphenyl)methane, 4-hydroxybenzaldehyde, $\beta$-sitosterol and plamitic acid. 1 and 2 were identified as 3-O-($4^1$-hydroxybenzyl)-$\beta$-sitosterol and 4-[$4^1$-($4^{11}$-hydroxybenzyloxy)benzyloxy]benzyl methyl ether, respectively, according to the spectroscopic data.

• 한국식품영양학회지
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• 제14권1호
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• pp.20-27
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• 2001

십자화과 식물인 무(Raphanus sativus L.)의 어린싹(무순)이 독특한 향과 맛으로 소비가 증가하고 있는바 그 향기성분을 SDE(simultaneous steam disti-llation/extraction) 법과 P&T(purge and cryogenic trapping)법으로 추출하여 비교, 분석하였다. 향기성분 포집시 SDE법에서는 diethyl ether 및 diethyl ether-pentane mixture(2:1, v/v)를 용매로 사용하고 P&T법에서는 diethyl ether를 사용하였다. GC와 GC-MS를 사용하여 동정한 결과 diethyl ether로 추출한 SDE법에서는 함황화합물(19종, 76.6%)이 주성분이었고, diethyl ether-pentane mixture로 추출한 경우 함황화합물(15종, 44.0%)과 탄화수소류(23종, 23.8%)가 주성분이었으며, P&T법으로 추출할 경우는 탄화수소류(25종, 84.1%)가 주성분이었다. 또한 신선한 무순의 주 향기성분은 hydrocarbon류인 n-heptane, methyl pentane이었으며, 익은 무순의 주 향기성분은 sulfur compound에 속하며 무의 주성분이기도 한 4-methylthio-3-butenyl isothiocyanate, methyl mercaptane, 2,3-dimethyl disulfide 등이었다. SDE법 보다 P&T법에 의해 추출할 경우 향기성분의 종류와 상대적인 양은 적어 분리능은 떨어지는 편이나 저분자 휘발성 물질은 오히려 더 많이 검출되어 추출방법에 따라 포집되는 향기성분의 종류와 양에 차이가 있었다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2000년도 봄 한국섬유공학회 학술발표회 논문집(Proceedings of the Korean Textile Conference)
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• pp.13-16
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• 2000

• Fibers and Polymers
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• 제2권1호
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• pp.131-134
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• 2001

Living cationic polymerization behaviors of isobutyl vinyl ehters (IBVE), initiated by iodomethyl methyl ether (IMME)/zinc iodide ($Znl_2$) have been investigated. The polymerization was carried out at 0, -15, and $-30^{\circ}C$ in toluene. It was found that the rate of polymerization increased as the IMME concentration increased and decreased as temperature decreased. 100% conversion was always achieved without exception. Furthermore, the number-average molecular weight ($M_{n}$) of polymers increased in direct proportion to monomer conversion. The molecular weights of polymers were in good agreement with the theoretical values, calculated on the basis that one polymer chain was formed by one IMME molecule and the values of polydispersity index are always less than 1.2, revealing the living nature. The living nature was also confirmed by synthesis of poly(IBVE-b-TBVE) by subsequent monomer addition of t-butyl vinyl ether (TBVE).

• Journal of the Korean Wood Science and Technology
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• 제29권4호
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• pp.53-59
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• 2001

비자나무 잎을 아세톤-물의 혼합용액으로 추출하고 n-hexane, chloroform, ethylacetate 및 물 분획으로 분류하여 동결건조하고 분말상 화합물로 조제하였다. 그 중에서 ethylacetate 용성 추출물을 메탄올-물 및 에탄올-헥산(n-hexane)의 혼합용액을 사용하여 Sephadex LH-20 칼럼상에서 크로마토그래피를 수행하였다. 비자나무 잎의 추출성분은 대부분 (+)-catechin, (-)-epicatechin, (+)-gallocatechin 및 (-)-epigallocatechin과 같은 flavan 화합물과 3'-O-methyl-(+)-catechin 및 3'-O-methyl-(-)-epicatechin과 같은 flavan의 methyl ether 화합물로 구성되어 있었으며 그 이외에 benzoic acid계 화합물인 protocatechuic acid도 단리 되었다. 단리된 화합물은 $^1H$- 및 $^{13}C$-NMR, NOE와 CI-MS 분석에 의해 화학구조를 구명하였다.