• 제목/요약/키워드: Solvent free conditions

검색결과 146건 처리시간 0.023초

Solvent-free 조건하에서 H3PMo12O40 촉매에 의한 Z-Aldoximes의 (Regioselective Synthesis of Z-Aldoximes Catalyzed By H3PMo12O40 under Solvent-Free Conditions)

  • Eshghi, Hossein;Alizadeh, Mohammad Hasan;Davamdar, Ehsan
    • 대한화학회지
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    • 제52권1호
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    • pp.52-56
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    • 2008
  • 제법을 위한 쉽고 효과적인 이 방법은 solvent-free하에서 H3PMo12O40 촉매를 사용해서 개선되었다. 이 방법의 큰 이점은 조작의 간편성, 더 작은 촉매량, 선택성, 온화한 반응조건,짧은 반응 시간 그리고 높은 수율이다. 재생된 촉매는 어떤 정제도 없이 다시 사용되어질 수 있다.

An Efficient Method for Selective Deprotection of Trimethylsilyl Ethers and Tetrahydropyranyl Ethers under Solvent-free Conditions

  • Hajipour, A.R.;Bagheri, Hamid R.;Ruoho, Arnold E.
    • Bulletin of the Korean Chemical Society
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    • 제26권11호
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    • pp.1689-1691
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    • 2005
  • 1-Butyl-4-aza-1-azoniabicyclo[2.2.2]octane dichromate (BAABOD) 3 is a useful reagent for the selective cleavage of trimethylsilyl ethers and tetrahydropyranyl ethers to their corresponding aldehydes and ketones in the presence of $AlCl_3$ under solvent-free conditions. This method is very simple and efficient and the reaction has been carried out under solvent-free conditions in the presence of a catalytically amount of aluminum chloride.

Efficient, Rapid and Solvent-free Cyanosilylation of Aldehydes and Ketones Catalyzed by SbCl3

  • Pourmousavi, S.A.;Salahshornia, H.
    • Bulletin of the Korean Chemical Society
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    • 제32권5호
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    • pp.1575-1578
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    • 2011
  • Antimony trichloride (SbCl3) was demonstrated to be an effective catalyst for the cyanosilylation of a wide variety of carbonyl compounds under solvent-free conditions. The reactions proceeded smoothly at room temperature to afford the corresponding cyanosilylethers in good to excellent yields.

An Organocatalyzed and Ultrasound Accelerated Expeditious Synthetic Route to 1,5-Benzodiazepines under Solvent-Free Conditions

  • Shinde, Pravin V.;Shingate, Bapurao B.;Shingare, Murlidhar S.
    • Bulletin of the Korean Chemical Society
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    • 제32권4호
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    • pp.1179-1182
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    • 2011
  • In the present work, successful implementation of ultrasound irradiations for the rapid synthesis of 1,5-benzodiazepine derivatives under solvent-free conditions is demonstrated. Use of a novel catalyst i.e. camphor sulphonic acid in combination with ultrasound technique is reported for the first time. Comparative study for the synthesis of 1,5-benzodiazepines using conventional as well as ultrasonication method is discussed.

Direct and Efficient Conversion of Tertiary Thioamides to S-2-Oxo Thioesters under Solvent-free Conditions

  • Boeini, Hassan Zali;Khajeh, Aida
    • Bulletin of the Korean Chemical Society
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    • 제32권4호
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    • pp.1201-1203
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    • 2011
  • A one-pot conversion of tertiary thioamides to S-2-oxo thioesters is reported. Hence, tertiary thioamides were reacted with ${\alpha}$-halo ketones or acids under solvent-free conditions to produce the corresponding oxo-thioesters in good to excellent yields.

Solvent-free Synthesis of Propargylic Alcohols using ZnO as a New and Reusable Catalyst by Direct Addition of Alkynes to Aldehydes

  • Hosseini-Sarvari, Mona;Mardaneh, Zahra
    • Bulletin of the Korean Chemical Society
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    • 제32권12호
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    • pp.4297-4303
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    • 2011
  • Under solvent-free conditions, the synthesis of propargylic alcohols by direct addition of terminal alkynes to aldehydes promoted by ZnO as a novel, commercially, and cheap catalyst is described. Furthermore, the catalyst can be reused for several times without any significant loss of its catalytic activity.

TMEDA Catalyzed Henry (Nitroaldol) Reaction under Metal and Solvent-free Conditions

  • Majhi, Anjoy;Kadam, Santosh T.;Kim, Sung-Soo
    • Bulletin of the Korean Chemical Society
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    • 제30권8호
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    • pp.1767-1770
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    • 2009
  • The Henry (nitroaldol) reaction proceeds under mild conditions with catalytic amount of tetramethylethylenediamine (TMEDA) to afford $\beta$-nitro alkanol in considerably excellent yield. Structurally diverse aldehydes react with nitromethane in presence of 0.3 equiv of TMEDA under solvent-free condition at rt. The low catalytic loading and mild reaction condition are the key features of the catalytic method.