Martin's sulfurane is the organosulfur compound with the formula PhS[OC(CF)Ph] (Ph = CH). It is a white solid that easily undergoes sublimation. The compound is an example of a hypervalent sulfur compound called a sulfurane. 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 (SF).  The compound is a reagent in organic synthesis. One application is for the dehydration of a secondary alcohol to give an alkene:
:RCH(OH)CHR  +  PhS[OC(CF)Ph]  →  RCH=CHR  +  PhSO  +  2 HOC(CF)Ph