Y. Kamitori et al., A FACILE AND CONVENIENT SYNTHESIS OF 5-TRIFLUOROMETHYL-4-PYRIDAZINONES FROM ALDEHYDE DIALKYLHYDRAZONES, Tetrahedron letters, 34(32), 1993, pp. 5135-5138
Several 5-trifluoromethyl-4-pyridazinones were conveniently synthesize
d by silica gel-mediated cyclization reaction of 1,1,1,2,2-pentafluoro
alkan-3,4-dione 4-dialkylhydrazones prepared from aldehyde dialkylhydr
azones and pentafluoropropionic anhydride.