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Two ty-pes of reactions were used to study the effect of substituents (CH3, OCH3 ) on the condensation of 5(6) ~substi­ t1Jted benzofurazan 1-oxides C1) with {methyl thio ) -2-·propanone (BFO Reaction, A), and 4substituted o-quinone dioximes (2) l'1../ vrith pyru.vald~hyde (OQD Reaction, B). The nitrogen atom is an electrophile in reaction A and nucleophile in reaction B .. ro:· ~N\ R · , 0 ~ ---~1 ~ oR-

Quinoxaline 1, 4-Dioxides. A Mechanistic Study of Their Formation and the Structural Assignment of 6(7) Isomeric Products