• 제목/요약/키워드: Dimethyl sulfate

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Acetonitrile 용액중에서 살충제 O, O-Dimethyl-O-(3-Methyl-4-Nitrophenyl)-Phosphorothioate (Fenitrothion)의 전기화학적 환원 (On the Electrochemical Reduction of O, O-Dimethyl-O-(3-Methyl-4-Nitrophenyl)-Phosphorthioate (Fenitrothion) Pesticide in Acetonitrile Solution)

  • 김일광;김윤근;천현자
    • 대한화학회지
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    • 제32권3호
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    • pp.186-194
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    • 1988
  • 계면활성 micelle을 형성하는 acetonitrile 용액을 O,O-dimethyl-O-(3-methyl-4-nitrophenyl)-phosphorothioate (Fenitrothion)의 전기화학적 환원을 direct current 및 differential pulase polarography, cyclic voltammetry 그리고 controlled potential coulometry 방법으로 연구하였다. Fenitrothion의 환원과정은 1단계로 4 전자 이동에 의한 부분 가역적 전자이동 화학반응(EC, EC)기구로 O,O-dimethyl-O-(3-methyl-4-hydroxyaminophenyl)-phosphorothioate를 형성하고, 더 높은 음전위에서 2 전자 이동에 따른 양성자 반응으로 phosphorus 원자와 phenoxy group의 단일 결합이 끊어지면서 주 생성물인 p-amino-m-cresol과 dimethyl thiophosphinic acid를 생성하였다. Sodium lauryl sulfate micelle 용액에서 polarography 환원파는 전체적으로 억제 되었으며 특히 1차 환원파는 음이온 micelle의 선택적 작용으로 2단계로 분리되었다.

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Chebulae Fructus중 페놀 물질 확인시의 Methylation법 비교 (Methylation Methods on Identification of Phenolics in Chebulae Fructus)

  • 김정숙
    • 동아시아식생활학회지
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    • 제4권1호
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    • pp.79-86
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    • 1994
  • Food quality in food processing and storage were affected by the kinds of phenolics involved. To analyze phenolics of Chebulae Fructus by the way of GC-MSm methylation and trimethylsilyation(TMS) are necessary. The methods of methylation were dimethyl sulfate method and diazomethane method. so this study was undertaken to research the better methylation method before measuring GC-MS. But dimethyl sulfate method of methylation was not sufficient to analyze phenolics. So the phenolics of Chebulae Fructus were analyzed by the diazomethane methylation method and TMS with the pyridine, N-O-bis-trimethylsilyl-acetamide(BSTFA) and trimethylchlorosilane(TMCS). With the exception of pyrogallol and phloroglucinol in insoluble phenolics of Chebulae Fructus, the greater part of phenolics. analysis could be analyzed by GC-MS in company with diazomethane methylation method and TMS.

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Antibacterial Sulfated Alkene from a Tunicate, Styela clava

  • Yun, So-Mi;Jang, Jun-Ho;Ryu, Ji-Eun;Choi, Byeong-Dae;Lee, Jong-Soo
    • Natural Product Sciences
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    • 제13권2호
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    • pp.132-134
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    • 2007
  • An analog of antibacterial sulfated alkene against Bacillus subtilis was isolated from a species of tunicate (Mideoduck), Styela clava, cultured at Jindong Bay, Korea. The structure was determined as 4,8-dimethyl-3-nonenyl sulfate by MS and spectral analysis such as UV IR and NMR.

RNase Resistant RNA in the Egg of Xenopus laevis: I. RNA Extraction and in Vitro Labeling

  • Chung, Hae-Moon
    • 한국동물학회지
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    • 제20권1호
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    • pp.9-18
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    • 1977
  • RNA 분해효소에 저항하는 RNA 분자들이 양서류의 난에 존재하는지의 여부를 조사하기 전에 필요한 몇가지 예비실험을 하기 위하여 Xenopus laevis에 난에서 RNA를 추출 하였다. Sephadex G-100 column chromatography는 세 개의 peak을 항상 보여주고 있다. 첫째 peak에 포함되어있는 고분자량의 RNA만을 $^{3}H$-dimethyl sulfate를 사용하여 시험관내에서 label하여 tRNA로부터의 base paired oligonucleotide의 참여를 배제하였다. 이 방법으로 아주 높은 specific activity를 얻을 수 있었으며 또한 부착된 methyl group은 대단히 안정성을 보였다.

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아크릴우레탄 폴리머의 합성과 대전방지특성 (Synthesis and Antistatic Property of Acryl Urethane Polymer)

  • 홍경호;정노희
    • 한국응용과학기술학회지
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    • 제26권1호
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    • pp.93-101
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    • 2009
  • Antistatic acrylic resin is made from n-butyl methacrylate, methyl methacrylate, dimethyl amino ethyl methacrylate(DMAEMA), 2-ethyl hexyl methacrylate, hydroxy ethyl methacrylate, 2,2'-azobis iso-butyronitrile by synthesis. To achieve a lowest surface resistance of antistatic acrylic resin was applied to a variety of synthesis processes. The acrylic resin has been determined from the value of surface resistance and -then the antistatic acrylic resin including dimethyl amino ethyl methacrylate of the 10%, 20% and 30% is synthesized. Finally, dimethyl sulfate(DMS) on a variety of weight ratios is added to antistatic acrylic resin. When DMAEMA / DMS weight ratio is 1/1, antistatic acrylic resin isn't haze the lower the surface resistance. Compared to the traditional antistatic agent, all aspects of the physical properties is outstanding.

Removal of Dimethyl Sulfide in Ceramic Biofilters Immobilized with Thiobacillus thioparus TK-m

  • Kim, Jong-Yeon;Kim, Byung-Woo
    • Journal of Microbiology and Biotechnology
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    • 제13권6호
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    • pp.866-871
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    • 2003
  • Malodorous gas of dimethyl sulfide (DMS) was biologically oxidized to sulfate by Thiobacillus thioparus TK-m (DSM5368) immobilized in/on ceramic beads. More than 99.99% of DMS removal efficiency was obtained in a ceramic-biofilter reactor of 3.91 when the feed concentrations were about 27.5 and 55.0 mg DMS/1 at $30^{circ}C$. However, the removal efficiency of the biofilter at above $40^{circ}C$ decreased to 4.5 mg DMS/(lㆍmin) which was 85% of that at $30^{circ}C$.

S$_H$2 Reaction on Silicon-Carbon Bond in the Photoreactions of 2, 3-Benzo-1, 1-diphenyl(or dimethyl)-1-sila-2-cyclobutene with Carbonyl Compounds

  • Kang, Kyung-Tai;Okazaki, Renji;Inamoto, Naoki
    • Bulletin of the Korean Chemical Society
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    • 제5권1호
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    • pp.32-37
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    • 1984
  • The photoreaction of 2, 3-benzo-1, 1-diphenyl (or dimethyl)-1-sila-2-cyclobutene (9 or 10) with an aldehyde or ketone results in 1:1 cycloadduct of [4 + 2] type. In the reactions of 2, 3-benzo-1, 1-dimethyl-1-sila-2-cyclobutene (10) with acetone and butanone, another 1:1 adducts (13) were also formed, respectively. The following facts indicate that the formation of adduct involves an attack of a triplet carbonyl compound on the silicon of the benzosilacyclobutene, an $S_H2$ process. (1) Even when the reaction of 9 with acetophenone was carried out under conditions such that more than 99% of incident light was absorbed only by acetophenone using the filter solution of aq. cupric sulfate, the same adduct was still formed. (2) When the reaction of 9 with acetone was carried out under oxygen atmosphere, only trace amount of adduct was formed.

Effect of Sulfate-based Cathode-Electrolyte Interphases on Electrochemical Performance of Ni-rich Cathode Material

  • Chae, Bum-Jin;Song, Hye Ji;Mun, Junyoung;Yim, Taeeun
    • Journal of Electrochemical Science and Technology
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    • 제11권4호
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    • pp.361-367
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    • 2020
  • Recently, layered nickel-rich cathode materials (NCM) have attracted considerable attention as advanced alternative cathode materials for use in lithium-ion batteries (LIBs). However, their inferior surface stability that gives rise to rapid fading of cycling performance is a significant drawback. This paper proposes a simple and convenient coating method that improves the surface stability of NCM using sulfate-based solvents that create artificial cathode-electrolyte interphases (CEI) on the NCM surface. SOx-based artificial CEI layer is successfully coated on the surface of the NCM through a wet-coating process that uses dimethyl sulfone (DMS) and dimethyl sulfoxide (DMSO) as liquid precursors. It is found that the SOx-based artificial CEI layer is well developed on the surface of NCM with a thickness of a few nanometers, and it does not degrade the layered structure of NCM. In cycling performance tests, cells with DMS- or DMSO-modified NCM811 cathodes exhibited improved specific capacity retention at room temperature as well as at high temperature (DMS-NCM811: 99.4%, DMSO-NCM811: 88.6%, and NCM811: 78.4%), as the SOx-based artificial CEI layer effectively suppresses undesired surface reactions such as electrolyte decomposition.