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- Title
Über 1, 5-Diphenyl-2, 3, 6, 7-tetrahydro-1 H, 5 H-pyrazolo[1, 2- a]pyrazole(2, 6-Diphenyl-1, 5-diazabicyclo[3, 3, 0]octane).
- Authors
Wagner-Jauregg, Th.; Zirngibl, L.; Demolis, A.; Günther, H.; Tam, S. W.
- Abstract
The synthesis of a 1, 5-diphenyl perhydro-pyrazolo-[1, 2-a] pyrazole (IV) (m. p. = 170-171°) by LiAlH4-reduction of its 3, 7-dioxo derivative Va, one of the stereoisomers of V, is described. Va was obtained in small yield by the reaction of cinnamic acid with its hydrazide or with hydrazine. It proved to be identical with the compound obtained previously by interaction of cinnamic acid hydrazide with iodine which in the literature erroneously had been described as N, N′-dicinnamoyl hydrazine. This hydrazine now was obtained by bis-acylation of hydrazine with cinnamoyl chloride. In Va the extremely low NMR. absorption of the tertiary protons at ρ = 4,6 ppm is probably due to the spatial grouping
- Publication
Helvetica Chimica Acta, 1969, Vol 52, Issue 6, p1672
- ISSN
0018-019X
- Publication type
Article
- DOI
10.1002/hlca.19690520625