• 제목/요약/키워드: resorcinols

검색결과 7건 처리시간 0.022초

Antifungal Activity of the Methanol Extract of Myristica malabarica Fruit Rinds and the Active Ingredients Malabaricones Against Phytopathogenic Fungi

  • Choi, Nam-Hee;Choi, Gyung-Ja;Jang, Kyoung-Soo;Choi, Yong-Ho;Lee, Sun-Og;Choi, Jae-Eul;Kim, Jin-Cheol
    • The Plant Pathology Journal
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    • 제24권3호
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    • pp.317-321
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    • 2008
  • In a search for plant extracts with in vivo antifungal activity for plant diseases, we found that the methanol extract of Myristica malabarica fruit rinds effectively suppressed the development of several plant diseases. The methanol extract exhibited potent 1-day protective activity against rice blast, tomato late blight, wheat leaf rust and red pepper anthracnose. It also showed 7-day and 4-day protective activities against the plant diseases. Three antifungal resorcinols were isolated from the methanol extract of M. malabarica fruit rinds and identified as malabaricones A(MA), B(MB), and C(MC). Inhibitory activity of the three resorcinols against mycelial growth of plant pathogenic fungi varied according to compound and target species. All three compounds effectively reduced the development of rice blast, wheat leaf rust and red pepper anthracnose. In addition, MC was highly active for reducing the development of tomato late blight. This is the first report on the antifungal activities of malabaricones against filamentous fungi.

Boron Trifluoride Etherate on Alumina-A Modified Lewis Acid Reagent(Ⅱ). Alkylation of 5-(1,1-dimethylheptyl)-Resorcinols

  • Baek Seung-Hwa;Kim Hak-Jin
    • Bulletin of the Korean Chemical Society
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    • 제13권2호
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    • pp.117-118
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    • 1992
  • Boron trifluoride etherate on alumina catalyses the condensation 5-(1,1-dimethylheptyl)-resorcinol, monoalkyl-5-(1,1-dimethylheptyl)-resorcinol and 5-(1,1-dimethylheptyl)-resorcinol dimethyl ether with 1-methyl-2-cyclohexen-l-ol. The products obtained was good to excellent yields.

Concise Synthesis of Biologically Interesting (±)-Cannabichromene, (±)-Cannabichromenic Acid, and (±)-Daurichromenic Acid

  • Lee, Yong-Rok;Wang, Xue
    • Bulletin of the Korean Chemical Society
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    • 제26권12호
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    • pp.1933-1936
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    • 2005
  • Total synthesis of biologically interesting $({\pm})$-cannabichromene, $({\pm})$-cannabichromenic acid, and $({\pm})$-daurichromenic acid is described. The key step in the synthetic strategy involves the formation of benzopyrans by ethylenediamine diacetate-catalyzed reactions of resorcinols with $\alpha$,$\beta$-unsaturated aldehydes.

Solvent Effects on the Structure of Resorcinol Formaldehyde Resin

  • Park, Sung-Seen
    • Macromolecular Research
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    • 제8권2호
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    • pp.53-58
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    • 2000
  • Stabilities and structures of resorcinol formaldehyde resins (RF resins) and their dependence on solvent were studied by molecular mechanics and molecular dynamics. Dimers to decamers of the RF resins in the conditions of dielectric constant = 1.00, 21.01, 36.64, and 80.10 were calculated. The average distance between oxygen atoms in 1-hydroxyl groups of adjacent resorcinols of the resins became longer with increased dielectric constant of the environment. The number of intramolecular hydrogen bonds of the resins decreased by increasing the dielectric constant of the environment. The RF resin structure on the surface of fabric or steel cord was explained based on the present calculation.

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Influence of Polycondensation Type on Structure of Resorcinol Formaldehyde Resin Studied by Molecular Simulation

  • Park, Sung-Seen
    • Macromolecular Research
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    • 제8권3호
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    • pp.125-130
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    • 2000
  • Resorcinol formaldehyde resins are synthesized by polycondensation of resorcinol with formal-dehyde and have various structures by the condensation type. The influence of polycondensation type on the stability and structure of the resorcinol formaldehyde resin was studied by molecular mechanics and molecular dynamics. The resins formed by 2,6-polycondensation and 4,6-polycondensationwith head-to-tail orientations have structures of intramolecular hydrogen bonds between 1-hydroxyl groups and between outer hydroxyl groups of the adjacent resorcinols, respectively. The resin formed by 2,6-polycon-densation with head-to-head orientation has a structure that inner hydroxyl groups cluster in the center of the molecule. Energetical stability of the resin is affected by both the intramolecular hydrogen bonds and the steric' hindrance by phenyl group.

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Resorcinol계 Photoresist의 합성과 그 감광 특성 (Synthesis and Photocharacteristics of Resorcinols Photoresist)

  • 근장현;김승진;박홍수
    • 공업화학
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    • 제5권4호
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    • pp.662-668
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    • 1994
  • Photoresist로의 응용을 위하여 감광성 관능기를 가진 폴리머인 polyresorcinol-formaldehyde glycidyl ether의 cinnamoyl ester(RGEFC)를 제조하였다. RGEFC의 감광 특성은 노광 전후의 유기용매에 대한 용해도 차이로서 결정하였는데, 유리판상에 도포한 각종 시료를 제반조건하에서 노광한 다음, 도포시에 사용한 같은 용매에 담그어 잔막수득량을 계산하였다. 필름의 감도와 밀접한 관계를 가지는 수득량은 수지의 중합도, 증감제의 종류 및 첨가농도에 따라 좌우되었으며, 그 감도는 폴리머의 중합도에 의존되어 중합도가 커질수록 증가되었다. 사용된 증감제 중 RGEFC에 대한 가장 효과적인 증감제는 2, 6-dichloro-4-nitroaniline이었다.

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