• 제목/요약/키워드: Phase Transfer Synthesis

검색결과 79건 처리시간 0.029초

ATRP를 이용한 Lysine 말단기를 가진 펩타이드-고분자 하이브리드 합성 (Solid Phase Synthesis of Lysine-exposed Peptide-Polymer Hybrids by Atom Transfer Radical Polymerization)

  • 하은주;김미진;김진구;안성수;백현종
    • 폴리머
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    • 제38권4호
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    • pp.550-556
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    • 2014
  • 펩타이드-고분자 하이브리드 소재(PPs)들은 선택적 용매에서 나노구조 형성을 위한 잠재적 구성 요소로서 많은 연구분야에 이용되고 있다. PPs는 잘 정의된 펩타이드-고분자로 이루어진 바이오콘주게이트의 손쉬운 제조방법과 다양한 응용분야에서 이들의 고유활성도에 대한 연구는 중요한 이슈이다. 본 연구에서는 atom transfer radical polymerization(ATRP)와 고체상 펩타이드 합성법을 이용하여 펩타이드-고분자 하이브리드 소재를 제조하였다. PYGK(proline-tyrosine-glycine-lysine) 펩타이드를 제조하기 위하여 일반적인 고체상 펩타이드 합성법을 이용하였다. PYGK 펩타이드는 섬유소용해(fibrinolysis) 과정에서 플라스미노젠과 반응하는 PFGK(proline-phenylalanine-glycine-lysine)와 유사한 펩타이드이다. 펩타이드와 펩타이드 개시제는 MALDI-TOF와 $^1H$ NMR을 이용하여 분석하였다. 펩타이드-고분자인 pSt-PYGK는 GPC, IR, $^1H$ NMR 분석법, 그리고 TLC를 이용하여 분석하였다. 구형 마이셀 집합체는 TEM과 SEM으로 측정하였다. 본 합성방법은 고유결합 활성도를 가진 잘 정의된 펩타이드-고분자 하이브리드 소재를 합성할 수 있는 기회를 제공한다.

Double Line Voltage Synthesis Strategy for Three-to-Five Phase Direct Matrix Converters

  • Wang, Rutian;Zhao, Yanfeng;Mu, Xingjun;Wang, Weiquan
    • Journal of Power Electronics
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    • 제18권1호
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    • pp.81-91
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    • 2018
  • This paper proposes a double line voltage synthesis (DLVS) strategy for three-to-five phase direct matrix converters. In the proposed strategy, the input and expected output voltages are divided into 6 segments and 10 segments, respectively. In addition, in order to obtain the maximum voltage transfer ratio (VTR), the input line voltages and "source key" should be selected reasonably according to different combinations of input and output segments. Then, the corresponding duty ratios are calculated to determine the switch sequences in different segment combinations. The output voltages and currents are still sinusoidal and symmetrical with little lower order harmonics under unbalanced or distorted input voltages by using this strategy. In addition, the common mode voltage (CMV) can be suppressed by rearranging some of the switching states. This strategy is analyzed and studied by a simulation model established in MATLAB/Simulink and an experimental platform, which is controlled by a DSP and FPGA. Simulation and experimental results verify the feasibility and validity of the proposed DLVS strategy.

Aliquat 336 상이동 촉매하에서 디페닐메탄의 산화에 의한 벤조페논의 합성 (Synthesis of Benzophenone by Oxidation of Diphenylmethane under Aliquat 336 as Phase Transfer Catalyst)

  • 박대원;이화수;문정열;박상욱;신정호
    • 공업화학
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    • 제5권1호
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    • pp.74-80
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    • 1994
  • 본 연구는 Aliquat 336 상이동 촉매와 potassium tert-butoxide 염기를 사용하여 상온에서 디페닐메탄을 산화시켜 벤조페논을 합성하는데 관한 것이다. 4급 암모늄염 촉매 존재하에서는 벤조페논이 합성되지 않는다고 보고된 다른 연구 결과와는 달리 Aliquat 336 촉매로 상온에서 30% 이상의 벤조페논 수율을 얻었다. Aliquat 336 촉매의 양과 potassium tert-butoxide의 양이 증가할수록 디페닐메탄의 전화율이 증가하였다. 산소의 분압이 높을수록 유기용매에 녹아 있는 산소의 농도가 증가하여 전화율과 선택도가 상승하였다. 또한 Aliquat 336 촉매의 역할이 포함된 반응 메카니즘을 제시하였다.

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광학재료로서 triazine기를 갖는 플라스틱 고분자에 대한 연구 (Study about Plastic Polymer bearing Triazine Group as Optical Material)

  • 이용희;김재종;서명교;이영세
    • 한국산업융합학회 논문집
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    • 제6권3호
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    • pp.171-176
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    • 2003
  • The poly(triazine bissulfide) synthesized from 6-dibutylamino-1,3,5-triazine-2,4-dithiol with bis(4-chloro-3-nitrophenyl) sulfone in the presence of the phase transfer catalyst, the maximum algebra viscosity (0.57 dL/g) is stable at reaction temperature of $60^{\circ}C$ overall. We could not acquire the good result about solubility, thermal property, and molecular weight to make cast film, we made base for the synthesis of functionalization polymer material.

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6,6-Dichlorobicyclo[3, 1, 0]hexane-3-carboxylic acid의 합성과 분석 (Synthesis and Analysis of 6,6-dichlorobicyclo[3, 1, 0]hexane-3-carboxylic acid)

  • 이광수;양재건
    • 분석과학
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    • 제14권1호
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    • pp.1-7
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    • 2001
  • 6,6-Dichlorobicyclo[3, 1, 0]hexane-3carboxylic acid를 phase transfer catalyst(PTC)로 benzyl triethylamine chloride(BTEA.Cl)를 사용하여 3-cyclopentenecarboxylic acid로부터 합성하였다. $^1H$ NMR과 $^{13}C$ NMR 분석을 통하여 이 화합물은 boat-like conformation을 갖는 것으로 나타났고 carboxyl group은 trans로 존재하는 것으로 나타났다.

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Polymer-Supported Crown Ethers(Ⅳ) Synthesis and Phase-transfer Catalytic Activity

  • Shim Jae Hu;Chung Kwang Bo;Masao Tomoi
    • Bulletin of the Korean Chemical Society
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    • 제13권3호
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    • pp.274-279
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    • 1992
  • Immobilization method of lariat azacrown ethers, containing hydroxyl group in the side arm of crown ring, on the polymer matrix and the phase-transfer catalytic activity of thus obtained immobilized lariat azacrown ethers were studied. Polystyrene resins with crown ether structures and hydroxyl groups adjacent to the macrorings were prepared by the reaction of crosslinked polystyrene resins containing epoxy groups with monoaza-15-crown-5 or monoaza-18-crown-6. Microporous crosslinked polystyrene resins containing epoxy group for the syntheses of these immobilized lariat crown catalysts were prepared by suspension polymerization of styrene, divinylbenzene (DVB 2%) and vinylbenzylglycidyl ether. The immobilized lariat catalysts with 10-20% ring substitution exhibited maximal activity for the halogen exchange reactions of 1-bromooctane with aqueous KI or NaI under triphase heterogeneous conditions. Immobilized catalyst exhibited higher activity than corresponding catalyst without the hydroxyl group and this result was suggested that the active site have a structure in which the $K^+$ ion was bound by the cooperative coordination of the crown ring donors and the hydroxyl group in the side arm.

Highly Enantioselective Synthesis of a-Alkyl-alanines via the Catalytic Phase-Transfer Alkylation of 2-Naphthyl aldimine tert-butyl ester by using O(9)-Allyl-N(1)-2'3'4'-trifluorobenzylhydrocinchoni

  • Jew, Sang-Sup;Lee, Jeong-Hee;Yoo, Mi-Sook;Lee, Yeon-Ju;Jeong, Byeong-Seon;Park, Boon-Saeng;Kim, Myoung-Goo;Park, Hyeung-Geun
    • 대한약학회:학술대회논문집
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    • 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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    • pp.252.1-252.1
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    • 2003
  • Systematic investigations to develop an efficient enantioselective synthetic method for a-alkyl-alanine by the catalytic phase-transfer alkylation were performed. The alkylation of 2-naphthyl aldimine tert-butyl ester, 1 E with RbOH and O(9)-allyl-N-2'3'4'-trifluorobenzylhydrocinchonidinium bromide, 6, at \ulcorner5 \ulcorner\ulcorner showed the highest enantioselectivities, up to 96% ee.

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