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http://hdl.handle.net/20.500.12358/26238
TitleRing transformation and complex formation of 3-acetyl-4, 5-dihydro-1, 2, 4-triazole oximes
Untitled
Abstract

Oximic 1,2,4-triazole ligands 2a–e were prepared from the reaction of 3-acetyl-4,5-dihydro-1H-1,2,4-triazoles 1a–e with hydroxylamine hydrochloride at room temperature. At higher temperatures, the reaction afforded, however, the novel ring transformation product 4-amino-2-(4-chlorophenyl)-5-methyl-2H-1,2,3,6-oxatriazine 3. The reaction of the ligands 2a–e with nickel (II) and palladium (II) acetates in ethanol at room temperature yielded the respective square planar complexes 5a–e, 6a,e. X-ray structure determination of one of these complexes (5a) revealed that metallation led to unexpected ring transformation of the triazole ligand. It is probable that such ring transformation generated the imidazole-N-oxide intermediate 4a which coordinated to Ni(II) ion, and the 4N-donor set comprises both imidazole nitrogen and arylhydrazone nitrogen. The whole process is associated with loss of one hydrogen molecule and …

Authors
Ferwanah, Abdel-Rahman S.
Awadallah, Adel M.
Awad, Boshra M
El-Halabi, Nabil M.
Boese, Roland
TypeJournal Article
Date2005
Subjects
ring transformation
nickel and palladium imidazole complexes
1,2,4-triazole oximes
1,2,3,6-oxatriazines
Published inInorganica chimica acta
SeriesVolume: 358, Number: 15
PublisherElsevier
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The institutional repository of the Islamic University of Gaza was established as part of the ROMOR project that has been co-funded with support from the European Commission under the ERASMUS + European programme. This publication reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.

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The institutional repository of the Islamic University of Gaza was established as part of the ROMOR project that has been co-funded with support from the European Commission under the ERASMUS + European programme. This publication reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.

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