... Tetrahedron Letters. Volume 22, Issue 35, 1981, Pages 3371–3374. Cover image Cover image. Furoxans as nitrile oxide precursors: Cycloaddition reactions of bis(benzenesulfonyl)furoxan. ... 19 May 1981, Available online 9 March 2001. Abstract. Bis(benzenesulfonyl)furoxan has been shown to undergo cycloaddition reactions with dipolarophiles in refluxing xylene to give benzenesulfonylnitrile oxide cycloadducts. References. 1; C. Grundmann, F. Grünger; ...