- Glucose:urea:NH4Cl low melting mixture for the synthesis of symmetric azines
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Alternate reaction media have become very important due to the problems created by the highly volatile nature of the solvents. The deep eutectic mixture is a kind of an alternate reaction medium which has emerged in recent years. Low melting mixtures were introduced by making the deep eutectic mixture more cost-effective and renewable by introducing carbohydrates into it. The properties of low melting mixtures include easiness to prepare, usage of low-cost components, biodegradability, solubility in water, easy separation from organic compounds, etc. The low melting mixtures such as glucose:urea:NH4Cl, glucose:ChCl, glucose:urea:ChCl, glycerol:urea:NH4Cl, and ethylene glycol:urea:NH4Cl were used in different ratios for the reactions. The properties such as viscosity, density, acidity, glass transition temperature, and thermal stability were studied. An unusual method for the synthesis of symmetrical azines is introduced wherein benzaldehyde and hydroxylamine are reacted in the presence of glucose:urea:NH4Cl. The method of synthesis needs only less reaction time, temperature and the product was easily separated. The products were confirmed using GC-MS and NMR techniques. The recyclability of glucose:urea:NH4Cl was studied.
- Theresa, Letcy V.,Shaibuna,Sreekumar
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- Selective and convenient protection of aldehydes as azines under solvent-free conditions
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Aldehydes can be easily protected as azines in the presence of hydrazine monohydrochloride and ferric chloride under solvent-free conditions. The major advantages of this method are: operational simplicity, ready availability, selectivity, general applicability, mild reaction conditions with low cost of the reactants, short reaction times and excellent yields.
- Eshghi, Hossein,Hosseini, Mosayyeb
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experimental part
p. 636 - 638
(2009/05/11)
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- Rapid, chemoselective and facile synthesis of azines by hydrazine/I2
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We report the reaction of hydrazine hydrate with carbonyl compounds in the presence of molecular iodine at 0-10°C, which affords symmetrical azines in excellent yields in 1 to 4 min without any adverse effect on other substituents. The reactions are rapid and chemoselective, afford excellent yields, and have high-purity products. The workup procedure is environmentally benign and does not require solvent extraction. Copyright Taylor & Francis Group, LLC.
- Nanjundaswamy,Pasha
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p. 3417 - 3420
(2008/02/13)
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- Selective protection of carbonyl compounds as azines and their facile regeneration
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Carbonyl compounds with freshly prepared hydrazinium formate successfully yielded the corresponding azines in excellent yields. In turn, azines were deprotected to the corresponding carbonyls using triethylammonium chlorochromate chemoselectively. Copyright Taylor & Francis Group, LLC.
- Nanjundaswamy,Pasha
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p. 3161 - 3165
(2007/10/03)
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- A convenient synthesis of azines under solvent-free conditions using microwave irradiation
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In an extremely fast method the reaction of hydrazine sulfate with a number of aldehydes and ketones, is accelerated by microwave irradiation under solvent free conditions in the presence of CH2CO2Na/CaCl2 to afford high yields of relevant azines.
- Khouzani-Loghmani, Hossein,Sadeghi, Majid M. M.,Safari, Javad,Abdorrezaie, Mohammad S.,Jafarpisheh, Masood
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- CO-OLIGOMERISATION DE BUTADIENE ET D'HETERODIENES AZOTES CATALYSEE PAR LE NICKEL CONTROLE DE LA SELECTIVITE
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Nickel (0) catalysed co-oligomerization of butadiene with heterodienes and hetero-olefins is described.It is shown how the selectivity of these reactions can be controlled by the position of the heteroatom in the heteropartner and also by the nature of th
- Brun, P.,Tenaglia, A,Waegell, B
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p. 5019 - 5030
(2007/10/02)
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