- Reaction of 2-Phenyl-4-arylidene-1,3-oxazolones with Different Nucleophiles for Synthesis of Some New Heterocycles
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Refluxing of 1,3-oxazolone (1a) with malononitrile in dry benzene and in the presence of ammonium acetate afforded imidazolone derivative (2). However, carrying out the same reaction in absolute ethanol and in the presence of piperidine as a base gave the
- Youssef,El-Mariah,Abd-Elmottaleb,Hashem
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p. 456 - 463
(2018/12/11)
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- Studies on the reactivity pattern of in situ generated tetraethylammonium superoxide with 2-oxazolin-5-ones
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A variety of 2-oxazolin-5-ones have been allowed to react under the mild reaction conditions of potassium superoxide and tetraethylammonium bromide in dry dimethylformamide at room temperature. Different products are obtained depending on the substituents attached to the C-4 position.
- Singh, Krishna Nand,Kumar, Rajesh
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p. 381 - 386
(2007/10/03)
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- Physical characteristics and polarographic reduction mechanism of some oxazolones
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The redox potential (ΔE1/2), electron affinity (EA), ionization potential (IP), coulomb repulsion integral (J12), and electronic transition energy (ECT) of several oxazolone derivatives in DMF were computed.A linear correlation was shown to exist between ΔE1/2 and ECT.The polarographic reduction was investigated in ethanolic-Theil buffer solutions.At pH /= 7.2, two waves were obtained representing the uptake of 2- and 4-electron steps respectively.In alkaline media, a third wave appeared seemingly a result of the hydrolysis of oxazolones.The rate of hydrolysis was determined and the electrode mechanism was elucidated and confirmed via spectrophotometric and coulometric analysis. Key words: oxazolones, polarography, electrochemistry, electrode reaction, spectrophotometry, redox potential.
- Ismail, M. I.
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p. 1886 - 1892
(2007/10/02)
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- N-Acyl Dehydro-α-amino Acids from N-Formyl Dehydro-α-amino Acid Esters
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On treatment with methyl potassioisocyanoacetate (2), aldehydes and ketones 1 give N-anionized N-formyl dehydro-α-amino acid methyl esters 3.Compounds 3 with R1 = CH3, R2 = H is obtained by base induced ring opening of methyl 2-oxazoline-4-carboxylate 5. - Acylation of 3, followed by deformation of the intermediates 6, yields N-acyl dehydro α-amino acid methyl esters 7 which can be hydrolyzed to the N-acyl dehydro α-amino-acids 8.
- Schoellkopf, Ulrich,Meyer, Rolf
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p. 1469 - 1475
(2007/10/02)
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