title: 4,5-Dihydro-1,2,3-oxadiazole: A Very Elusive Key Intermediate in Various Important Chemical Transformations.
abstract: 4,5-Dihydro-1,2,3-oxadiazoles are postulated to be key intermediates in the industrial synthesis of ketones from alkenes, in the alkylation of DNA in vivo, and in the decomposition of N-nitrosoureas; they are also a subject of great interest for theoretical chemists. In the presented report, the formation of 4,5-dihydro-1,2,3-oxadiazole and the subsequent decay into secondary products have been studied by NMR monitoring analysis. The elusive properties evading characterization have now been confirmed by (1) H, (13) C, and (15) N NMR spectroscopy, and relevant 2D experiments at very low temperatures. Our experiments with suitably substituted N-nitrosoureas using thallium(I) alkoxides as bases under apolar conditions answer important questions on the existence and the secondary products of 4,5-dihydro-1,2,3-oxadiazole.
authors.affiliation: Organic Chemistry, Technische Universität Chemnitz, Strasse der Nationen 62, 09111 Chemnitz (Germany) https://www.tu-chemnitz.de/chemie/org/index.html.en. klaus.banert@chemie.tu-chemnitz.de.
authors.forename: Klaus
authors.initials: K
authors.lastname: Banert
authors.affiliation: Organic Chemistry, Technische Universität Chemnitz, Strasse der Nationen 62, 09111 Chemnitz (Germany) https://www.tu-chemnitz.de/chemie/org/index.html.en.
authors.forename: Neeraj
authors.initials: N
authors.lastname: Singh
authors.affiliation: Theoretical Chemistry, Technische Universität Chemnitz, Strasse der Nationen 62, 09111 Chemnitz (Germany).
authors.forename: Benjamin
authors.initials: B
authors.lastname: Fiedler
authors.affiliation: Theoretical Chemistry, Technische Universität Chemnitz, Strasse der Nationen 62, 09111 Chemnitz (Germany). joachim.friedrich@chemie.tu-chemnitz.de.
authors.forename: Joachim
authors.initials: J
authors.lastname: Friedrich
authors.affiliation: Inorganic Chemistry, Technische Universität Chemnitz, 09107 Chemnitz (Germany).
authors.forename: Marcus
authors.initials: M
authors.lastname: Korb
authors.affiliation: Inorganic Chemistry, Technische Universität Chemnitz, 09107 Chemnitz (Germany).
authors.forename: Heinrich
authors.initials: H
authors.lastname: Lang
keywords: NMR spectroscopy; alkylation; cycloreversion; nucleophilic substitution; reactive intermediates