• Title/Summary/Keyword: Aldoximes

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

  • Eshghi, Hossein;Alizadeh, Mohammad Hasan;Davamdar, Ehsan
    • Journal of the Korean Chemical Society
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    • v.52 no.1
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    • pp.52-56
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    • 2008
  • facile and efficient method for the preparation of Z-aldoximes is improved by means of H3PMo12O40 catalyst in solvent-free media. The major advantages of this method are: operational simplicity, low catalyst loading, selectivity, mild reaction conditions, short reaction times and excellent yields. The recovered catalyst could be used in new attempts without any purification.

Selective Reduction of Oximes to N-Monosubstituted Hydroxylamines with Lithium Borohydride

  • Cho, Byung-Tae;Seong, See-Yearl
    • Bulletin of the Korean Chemical Society
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    • v.9 no.5
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    • pp.322-324
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    • 1988
  • Selective reduction of aldoximes and ketoximes with lithium borohydride in tetrahydrofuran was investigated. Thus, aldoximes and cyclic ketoximes such as hexanaldoxime, heptanaldoxime, cyclopentanone oxime and cyclohexanone oxime were reduced smoothly to the corresponding N-monosubstituted hydroxylamines at room temperature in 65-93% yield. The reduction of alicyclic ketoxime was very slow, requiring somewhat high reaction temperature ($65^{\circ}C$) for the complete reduction to give the hydroxnylamines. The reduction of aromatic oximes such as benzaldoxime and acetophenone oxime was very sluggish, giving a mixture of the corresponding hydroxylamines and amines at $65^{\circ}C$.

Synthetic Applications of Di-2-pyridyl Thionocarbonate As a Dehydration, a Dehydrosulfuriation, and a Thiocarbonyl Transfer Reagent

  • Kim, Sung-Gak;Yi, Kyu-Yang
    • Bulletin of the Korean Chemical Society
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    • v.8 no.6
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    • pp.466-470
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    • 1987
  • Di-2-pyridyl thionocarbonate, prepared from thiophosgene and 2-hydroxypyridine in the presence of triethylamine in dichloromethane, was found to be very effective for dehydration, dehydrosulfurization, and thiocarbonyl transfer reactions. Di-2-pyridyl thionocarbonate was successfully for the esterification of carboxylic acids, dehydration of aldoximes into nitriles, preparation of isothiocyanates from amines, and preparation of cyclic thionocarbonates from 1,2- and 1,3-diols.

A New and Convenient Method for Reduction of Oximes to Amines with NaBH3CN In the Presence of MoCl5/NaHSO4·H2O System

  • Kouhkan, Mehri;Zeynizadeh, Behzad
    • Bulletin of the Korean Chemical Society
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    • v.32 no.9
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    • pp.3323-3326
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    • 2011
  • Various aldoximes and ketoximes were efficiently reduced to their corresponding amines with $NaBH_3CN$ in the presence of $MoCl_5/NaHSO_4{\cdot}H_2O$ system. Reduction reactions were carried out in refluxing EtOH or DMF within 0.3-3.8 h to afford the amines in high to excellent yields.

A Rapid and Practical Protocol for Solvent-Free Reduction of Oximes to Amines with NaBH4/ZrCl4/Al2O3 System

  • Zeynizadeh, Behzad;Kouhkan, Mehri
    • Bulletin of the Korean Chemical Society
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    • v.32 no.9
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    • pp.3448-3452
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    • 2011
  • Solvent-free reduction of various aldoximes and ketoximes to the corresponding amines was performed easily and efficiently with $NaBH_4$ in the presence of $ZrCl_4$ supported on $Al_2O_3$. The reactions were carried out rapidly (within 2 min) at room temperature to afford the amines in high to excellent yields.