A MULTINUCLEAR MAGNETIC RESONANCE STUDY OF SOME MESOIONIC OXATRIAZOLES CONTAINING NITROGENOUS EXOCYCLIC GROUPS

Авторы

  • Wojciech Bocian Institute of Organic Chemistry, Polish Academy of Sciences, 01-224 Warsaw 42, POB 58
  • Jаrosław Jaźwínski Institute of Organic Chemistry, Polish Academy of Sciences, 01-224 Warsaw 42, POB 58
  • Lech Stefaniak Institute of Organic Chemistry, Polish Academy of Sciences, 01-224 Warsaw 42, POB 58
  • Graham A. Webb Institute of Organic Chemistry, Polish Academy of Sciences, 01-224 Warsaw 42, POB 58

Аннотация

1Н, 13С, 14N and 15N NMR measurements are reported for four mesoionic 1-oxa-2,3,4-triazoles containing exocyclic nitrogenous groups. The NMR signal assignments are discussed and compared with those previously published for some corresponding oxatriazoles. The results obtained support the proposed cyclic mesoionic structures for the compounds studied. The questions of possible charge delocalisation and valence tautomerism are discussed. Compound with N− H as an exocyclic group (Fig. 1) is found
to be relatively unstable, this is attributed to proton migration in the corresponding noncyclic form of this molecule.

How to Cite
Bocian, W.; Jaźwínski, J.; Stefaniak, L.; Webb, G. A. Chem. Heterocycl. Compd. 1995, 31, 1103. [Khim. Geterotsikl. Soedin. 1995, 1260.]

For this article in the English edition, see DOI https://doi.org/10.1007/BF01165057

Загрузки

Опубликован

1995-09-25

Выпуск

№ 9 (1995)

Раздел

Оригинальные статьи