- Basic alumina as an efficient catalyst for preparation of semicarbazones in solvent free conditions
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An efficient and simple procedure for conversion of different classes of aldehydes and ketones into the corresponding semicarbazones with semicarbazide hydrochloride using basic alumina is studied.
- Kiasat, Ali Reza,Kazemi, Foad,Mehrjardi, Mehdi Fallah
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p. 1337 - 1339
(2008/03/13)
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- Vilsmeier formylation of hydrazones and semicarbazones derived from alkyl, benzyl, and cycloalkyl methyl ketones
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Formylation of ten accessible phenylhydrazones and semicarbazones derived from alkyl, benzyl, and cycloalkyl methyl ketones with the complex of POCl 3 with dimethylformamide was studied. Depending on the electronic and steric structure of the substrates, the reaction yields 1-phenyl- or 1-unsubstituted 3,4-dialkyl-, 3-alkyl-4-aryl-, or 3-alkyl-4-formylpyrazoles. These compounds can be readily oxidized into the corresponding carboxylic acids. 2005 Pleiades Publishing, Inc.
- Lebedev,Lebedeva,Sheludyakov,Kovaleva,Ustinova,Kozhevnikov
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p. 412 - 416
(2007/10/03)
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- Reactions of diazoalkanes with isocyanates. Synthesis of imidazolidine-2,4-diones, oxindoles, and oxazolidinones
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Thermolysis of a 5,5-dialkyl-Δ3-1,3,4-oxadiazolin-2-one in nitrobenzene containing an aryl isocyanate at 150 deg C affords a 1,3-diaryl-5,5-dialkyl imidazolidine-2,4-dione, an N-arylcarbamoyl-3,3-dialkyloxindole, and a 3-aryl-2-arylimino-5,5-dialkyl-1,3-oxazolidin-4-one.Those products arise from attack of a diazoalkane, generated in situ from the oxadiazolinone by thermal cycloreversion, on the isocyanate function.Two imidazolidine diones, three oxazolidinones, and 14 oxindoles were prepared.
- Fulton, Janet B.,Warkentin, John
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p. 1177 - 1184
(2007/10/02)
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