Martin's sulfurane is the organosulfur compound with the formula Ph2S[OC(CF3)2Ph]2 (Ph = C6H5).

It is a white solid that easily undergoes sublimation.

As such, the sulfur adopts a see-saw structure, with a lone pair of electrons as the equatorial fifth coordinate of a trigonal bipyramid, like that of sulfur tetrafluoride (SF4).

[1] The compound is a reagent in organic synthesis.

One application is for the dehydration of a secondary alcohol to give an alkene:[2]