Abstract: | The synthesis and spectral characteristics of a bis-spiro compound: 2,6-bis(4-phenyl-3-δ1-pyrazolinyl)cyclo-hexanone are reported. Unlike literature reports, this particular δ1-pyrazoline does not readily rearrange to the 2 isomer on heating. Pyrolysis gives 2,6-bis(α-methylbenzylidene)cyclohexanone. A monopyrazolinylket-one was also isolated which is most likely an intermediate in the bis-denitrogenation. A mechanism for the denitrogenation-rearrangement is proposed. |