Derivatives of Δ2-pyrazoline-products of 1,5-diaminotetrazole interaction with chalcone: Molecular structure and spectral properties
摘要:
1,5-diaminotetrazole at conditions of its interaction with chalcones (1,3-diphenylpropenones) in hot DMF undergoes Dimroth rearrangement to 5-tetrazolylhydrazine, which results in formation of 1-(5-tetrazolyl)-3,5-diaryl-Delta(2)-pyrazolines (1). Structure of the obtained products was confirmed by their parallel synthesis and X-ray structural analysis. Unusual fluorescence behavior of the tetrazolopyrazolynes in polar solvents was attributed to the dissociation of their highly acidic tetrazole N-H group. The last hypothesis was confirmed at the investigation of the protolytic interactions of I with tertiary amine. (c) 2005 Elsevier B.V. All rights reserved.