Monatshefte fur Chemie p. 971 - 977 (1996)
Update date:2022-08-03
Topics:
Lorand
Aradi
Szoelloesy
Toth
Konya
The acid and base catalyzed isomerization of some tricyclic 2-pyrazolines with N-Carbamoyl-, N-thiocarbamoyl- and N-phenyl substituents was investigated. Starting from cis or trans 3-H, 3a-H diastereomers, equilibrium mixtures of cis and trans diastereomers were prepared which were separated and subsequently studied by 1H NMR and 13C NMR spectroscopy. A mechanism for the isomerization of the pyrazolines is suggested, supported by a deuterium exchange at C-3a.
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