• Title/Summary/Keyword: Alkene

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Efficient Synthesis of Benzoprostacyclins Using Free-Radical and Palladium-Catalyzed Tandem Alkene Insertion Strategies

  • Lee, Nam Ho;Richard C. Larock
    • Bulletin of the Korean Chemical Society
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    • v.22 no.8
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    • pp.857-866
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    • 2001
  • Efficient syntheses of PGI2 analogue 2a and its epimer 3 have been accomplished. Using aryl iodide 6 as the common intermediate, either radical or palladium-assisted tandem alkene insertion strategies have been employed for construction of the benzoprostacyclin framework.

Quantitative structure activity relationship (QSAR) between chlorinated alkene ELUMO and their chlorine

  • Tang, Walter Z.;Wang, Fang
    • Advances in environmental research
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    • v.1 no.4
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    • pp.257-276
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    • 2012
  • QSAR models for chlorinated alkenes were developed between $E_{HOMO}$ and their chlorine and carbon content. The aim is to provide valid QSAR model which is statistically validated for $E_{LUMO}$ prediction. Different molecular descriptors, $N_{Cl}$, $N_C$ and $E_{HOMO}$ have been used to take into account relevant information provided by molecular features and physicochemical properties. The best model were selected using Partial Least Square (PLS) and Multiple Linear Regression (MLR) led to models with satisfactory predictive ability for a data set of 15 chlorinated alkene compounds.

Platinum/Nickel Catalyzed Selective Hydrosilylation of Alkynes and Alkenes with 1,1'-Bis(dimethylhydrosilyl) Ferrocene (백금/니켈 촉매를 이용한 1,1'-Bis(dimethylhydrosilyl)ferrocene과 Alkynes, Alkenes의 선택적 Hydrosilyation 반응)

  • Kim, Jin-Sik;Kong, Young-Kun
    • Journal of the Korean Chemical Society
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    • v.54 no.1
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    • pp.27-37
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    • 2010
  • The reaction of 1,1'-bis(dimethylhydrosilyl)ferrocene with alkynes in the presence of a catalytic amount of ($C_2H_4$)Pt$(PPh_3)_2$ leads to the acyclic mixture of monohydrosilylated and/or dihydrosilylated compounds. But the analogous reactions in the presence of Ni$(PEt_3)_4$ catalyst yield monohydrosilylated compounds or dihydrosilylated products. The monohydrosilylated products were generated from the reactions of alkenes with the silylated ferrocene using nickel catalyst.

An Efficient Synthesis of 12-epi-Carbacyclins Using a Palladium-Mediated Tandem Alkene Insertion Strategy

  • Lee, Nam-Ho;Larock, Richard C.
    • Bulletin of the Korean Chemical Society
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    • v.23 no.1
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    • pp.86-92
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    • 2002
  • A short synthesis of novel prostanoids, 12-epi-carbacyclins 3 and 24, has been accomplished using palladium chemistry as a key step. The silyl enol ether 10a prepared through organopalladium chemistry has been allowed to react with 1-octen-3-one in the presence of $Pd(OAc)_2$ to give compound 12 in a single step. The unusual chemo- and stereoselective reduction of the ${\alpha},{\beta}$-unsaturated ketone in 12 has been effected with (S)-BINALH. Subsequent desilylation and Wittig reaction have provided the Subsequent desilylation and Wittig reaction have provided the $PGI_2$ analogues 3 and 24.

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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    • v.13 no.2
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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.