Synthesis of some disubstituted 1,2,4-oxadiazoles and furazans
作者:B. W. Nash、R. A. Newberry、R. Pickles、W. K. Warburton
DOI:10.1039/j39690002794
日期:——
No Beckmann rearrangement occurs when ω-chlorophenylglyoxime is treated with phosphorus pentachloride, and the steam-volatile product is 3-chloro-4-phenylfurazan (II; R = Cl), not, as previously reported, 3-chloro-5-phenyl-1,2,4-oxadiazole (I; R = Cl).
当用五氯化磷处理ω-氯苯基乙二肟时,不会发生贝克曼重排,并且蒸汽挥发产物为3-氯-4-苯基呋喃山(II; R = Cl),而不是以前报道的3-氯-5-苯基- 1,2,4-恶二唑(I; R = Cl)。
Kinetics and Mechanism of Oxidation of Hydroxyurea Derivatives with Hexacyanoferrate(III) in Aqueous Solution
Kinetics and mechanisms of the oxidation of methoxyurea and N-methylhydroxyurea were studied in neutral and basic aqueoussolutions. The obtained pH dependences of the oxidation rates indicate that for both hydroxyureas the reactive species are the deprotonated ones. The second order rate constants, the activation enthalpies and the activation entropies for the reactions of methoxyurea (O- methylhydroxyurea)
A Facile Synthesis of 1,2,4-Oxadiazolidin-3-ones via Tandem <i>O,N</i>-Addition of Hydroxyureas to Methyl Propiolate
作者:Kyukwan Zong
DOI:10.1055/s-1998-1936
日期:1998.11
BENNOUNA, CHAKIB;PETRUS, F.;VERDUCCI, J.;HAUW, C.;GAULTIER, J., CAN. J. CHEM., 1981, 59, N 19, 2891-2897
作者:BENNOUNA, CHAKIB、PETRUS, F.、VERDUCCI, J.、HAUW, C.、GAULTIER, J.
DOI:——
日期:——
Hydroxylamine as an oxygen nucleophile: substitution of sulfonamide by a hydroxyl group in benzothiazole-2-sulfonamides
作者:Jos J. A. G. Kamps、Roman Belle、Jasmin Mecinović
DOI:10.1039/c2ob26929e
日期:——
the corresponding amine. Mechanistic studies that employ a combination of structure–reactivity relationships, oxygen labeling experiments, and (in)direct detection of intermediates and products reveal that the reaction proceeds via oxygen attack, and that oxygen incorporated in the 2-hydroxybenzothiazole product derivesfrom hydroxylamine. The reaction, which is performed under mild conditions, can be