title: Unusual reaction of 2-(trifluoromethyl)-1,2-dihydro-3lambda(6)-thieno- [2,3-c]chromen-3,3,4-triones with hydrazine as a new route to 3-hydrazinopyridazine derivatives.
abstract: Oxidation of 2-(trifluoromethyl)-1,2-dihydro-4H-thieno[2,3-c]chromen-4-ones 2 with H(2)O(2) in AcOH gives 2-(trifluoromethyl)-1,2-dihydrothieno[2,3-c]chromen-3,3,4-triones 3, which are transformed into 3-hydrazinopyridazine derivatives 4 in high yields by treatment with hydrazine hydrate in ethanol.
authors.affiliation: Department of Chemistry, Ural State University, 620083 Ekaterinburg, Russian Federation. vyacheslav.sosnovskikh@usu.ru
authors.forename: Vyacheslav Ya
authors.initials: VY
authors.lastname: Sosnovskikh
authors.forename: Boris I
authors.initials: BI
authors.lastname: Usachev
authors.forename: Ivan I
authors.initials: II
authors.lastname: Vorontsov