ABSTRACT The reaction of 3-aryl-2_H_-azirines with difluorocarbene involves the formation of azirinium difluoromethanides—the first strained azomethine ylides which undergo 1,3-dipolar cycloaddition with dimethyl acetylenedicarboxylate, giving rise to fluorinated fused azirinopyrrole derivatives. The reaction of 3-aryl-2_H_-azirines with difluorocarbene involves the formation of azirinium difluoromethanides—the first strained azomethine ylides which undergo 1,3-dipolar cycloaddition with dimethyl acetylenedicarboxylate, giving rise to fluorinated fused azirinopyrrole ... إقراء المزيد