Abstract
Treatment of 5,6-di-tert-butyl-2,3,7-trithiabicylo-5-ene 7-endoxide with trimethylsilyl trifluoromethanesulfonate at room temperature resulted in the rearrangement of tert-butyl group to furnish 4,6-di-tert-butyl-2,3,7-trithiabicylo-5-ene 7-endoxide quantitatively. Meanwhile, treatment of the compound by trimethyloxonium tetrafluoroborate afforded 4,5-di-tert-butyl-1,2-dithiin 1,1-dioxide in addition to the above rearrangement product.