97673-83-1Relevant articles and documents
Reaction of substituted 1,2,8,9-tetraazadispiro[4.1.4.3]tetradeca-1,8-dien- 6-ones and 1,2,8,9-tetraazadispiro[4.1.4.2]trideca-1,8-dien-6-ones with chlorine
Molchanov,Eremeeva,Kopf,Kostikov
, p. 435 - 441 (2008)
Reaction of 4,11-diaryl-1,2,8,9-tetraazadispiro[4.1.4.3]tetradeca-1,8-dien- 6-ones and-dispiro[4.1.4.2]trideca-1,8-dien-6-ones with chlorine gives substituted dispirocyclic compounds containing a 3-chloro-1-pyrazoline fragment which loses nitrogen on heating to give spirocyclic chlorocyclopropanes.
The Synthesis and Chemistry of a bis-Pyrazolinylketone and the Structure Determination
Lin, Tay-yean,Cromwell, Norman H.,Kingsbury, Charles A.
, p. 21 - 24 (2007/10/02)
The synthesis and spectral characteristics of a bis-spiro compound: 2,6-bis(4-phenyl-3-Δ1-pyrazolinyl)cyclohexanone are reported.Unlike literature reports, this particular Δ1-pyrazoline does not readily rearrange to the δ2 isomer on heating.Pyrolysis gives 2,6-bis(α-methylbenzylidene)cyclohexanone.A monopyrazolinylketone was also isolated which is most likely an intermediate in the bis-denitrogenation.A mechanism for the denitrogenation-rearrangement is proposed.
Syntheses and Pyrolysis of Some α,α'-Bis(spiro(4-aryl-1-pyrazoline))cycloalkanones
Rao, CH. Bheemasankara,Raju, P. V. Narasimha
, p. 321 - 327 (2007/10/02)
α,α'-Bis(spiro(4-aryl-1-pyrazoline))cycloalkanones (IIa-m) have been synthesized through cycloaddition of diazomethane to α,α'-diarylidenecycloalkanones (Ia-m) which, in turn, are prepared by the aldol condensation of cyclopentanones and cyclohexanones with arylaldehydes and furfuraldehyde.Pyrolysis of bis-spiro compounds yields methyl dienes (VIa-c, l) with expanded ring systems in some cases and in one case formation of cyclopropane (VIII) without ring expansion is observed.
