• Title/Summary/Keyword: Solvent-Free Conditions

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NaHSO4·SiO2 촉매를 이용한 Knoevenagel 축합을 거친α,β의 불포화산, α-Cyanoacrylonitriles와 α-Cyanoacrylates의 합성을 위한 무수조건하의 반응 절차 (Dry Media Reaction Procedure for Synthesis of α,β-Unsaturated Acids, α-Cyanoacrylonitriles and α-Cyanoacrylates via Knoevenagel Condensation Using NaHSO4·SiO2 Catalyst)

  • Gopalakrishnan, M.;Sureshkumar, P.;Kanagarajan, V.;Thanusu, J.;Thirunavukkarasu, S.
    • 대한화학회지
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    • 제51권4호
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    • pp.346-351
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    • 2007
  • NaHSO4·SiO2를 사용하는 solvent-free 조건하에서 E-geometry를 가진 α,β의 불포화산, α-Cyanoacrylonitriles 와 α-Cyanoacrylates의 효율적인 입체선택적 반응을 수행하였다.

Solvent-Free Michael Addition Between EMME and Secondary Amine under Focused Microwave Irradiation

  • Kim, Ki-Won;Lee, Hee-Jung;Jo, Jeong-Im;Kwon, Tae-Woo
    • Bulletin of the Korean Chemical Society
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    • 제31권5호
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    • pp.1155-1158
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    • 2010
  • Microwave-assisted Michael reaction between EMME and various amines such as diphenylamine, 4-methyl-N-phenylbenzenamine, N-phenylnaphthalen-1-amine, dihexylamine, diisopropylamine, and 4-nitrobenzenamine were described. Solvent-free conditions on alumina as solid support in the presence of $K_2CO_3$ catalysts gave moderate to good yields (55 - 93%) of diethylmalonate analogues having enamine moieties under focused microwave irradiation.

Facile Synthesis of 3-Thioxo-3H-benzo[f]chromen-2-yl methanone and 3H-Benzo[f]chromene-3-one Under Solvent Free Condition

  • Singh, Okram Mukherjee;Devi, Nepram Sushuma;Devi, Laishram Ronibala;Lim, Ki-Bum;Yoon, Yong-Jin;Lee, Sang-Geyong
    • Bulletin of the Korean Chemical Society
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    • 제32권1호
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    • pp.175-178
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    • 2011
  • A facile, convenient, efficient and high yielding synthesis of a combinatorial library of coumarins has been developed by the condensation of readily available $\beta$-oxodithioesters and S,S-acetal with 2-hydroxy-1-naphthaldehyde in the presence of catalytic amount of $CuCl_2$ under solvent free conditions.

Microwave-Assisted One-Pot Synthesis of Octahydroquinazolinone Derivatives Catalyzed by Thiamine Hydrochloride Under Solvent-free Condition

  • Badadhe, Pravin V.;Chate, Asha V.;Hingane, Dattatraya G.;Mahajan, Pravin S.;Chavhan, Namdev M.;Gill, Charansingh H.
    • 대한화학회지
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    • 제55권6호
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    • pp.936-939
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    • 2011
  • Thiamine hydrochloride (VB1) has been used as an acid catalyst in organic synthesis. One pot three component Biginelli condensation of dimedone, urea/thiourea and substituted aromatic aldehydes catalyzed by 10 mol % of thiamine hydrochloride (VB1) in solvent free condition under microwave irradiation in good to excellent yields has been investigated. Utilization of microwave irradiation, simple reaction conditions, short reaction time, ease of product isolation, and purification makes this manipulation very interesting from an economic and environmental perspective.

친환경 촉매 Iron (III) phosphate: 실온/무용매 반응조건에서 알코올과 페놀의 선택적인 아실화 반응 (Iron (III) Phosphate as a Green and Reusable Catalyst Promoted Chemo Selective Acetylation of Alcohols and Phenols with Acetic Anhydride Under Solvent Free Conditions at Room Temperature)

  • Behbahani, F.K.;Farahani, M.;Oskooie, H.A.
    • 대한화학회지
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    • 제55권4호
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    • pp.633-637
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    • 2011
  • 알코올과 페놀 계 화합물을 아실화시키는 반응에서, iron (III) phosphate 촉매를 사용했을 때에, 좋은 수율로 아실화 화합물을 얻었다. Iron (III) phosphate 촉매는 또한 친환경 반응에 재사용할 수 있는 친환경 촉매이다.

An Efficient and Environmentally Friendly Procedure for the Synthesis of Some Novel 8-Benzylidene-4-phenyl-3,4,5,6,7,8-hexahydro-1H-quinazolin-2-ones/thiones using Tetrabutylammonium Hexatungstate as a Reusable Heterogeneous Catalyst under Solvent-Free Conditions

  • Ghashang, Majid;Mansoor, Syed Sheik;Aswin, Krishnamoorthy
    • Bulletin of the Korean Chemical Society
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    • 제34권11호
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    • pp.3289-3294
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    • 2013
  • An efficient method for the preparation of 8-benzylidene-4-phenyl-3,4,5,6,7,8-hexahydro-1H-quinazolin-2-ones/thiones from the reaction of aromatic aldehydes with cyclohexanone and urea or thiourea in the presence of Tetrabutylammonium hexatungstate, $[TBA]_2[W_6O_{19}]$, as an efficient, inexpensive catalyst under thermal and solvent-free conditions has been developed. Good yields, short reaction times, straightforward workup, reusability of the catalyst, and green conditions are the most obvious advantages of this procedure.