Benzofuroxan () reacts with phosphorusylide to give benzimidazole derivatives and , Whereas reaction of with ylide furnishes quinoxaline via an Initial Wittig-type reaction. Similarly the reaction between the furoxano[3.4-b]quinoxalines or and the ylide yielded compounds and , respectively. In these reactions as well as in the reactions of the above furoxans with other phosphorusylides, a significant deoxygenation