Sulfur/carbon double and triple bonds
Preparation and structural behaviour of the three classes of sulfur compounds R2C=5F4, R-CSF3 and R2C=SOF2 is described. The alkylidene sulfur tetrafluorides are formed by elimination of C-SF5 compounds or by special isomerization reactions. They exhibit a rigid trigonal bipyramidal structure with the double bonded carbon in the equatorial position, and the carbon substituents in the axial plane. The alkylidyne sulfur trifluorides are analogous to acetylenes, however they are not completely linear, although the extent of this is still disputed. The alkylidene sulfur difluoride oxides are formed hy hydrolysis of the corresponding sulfur tetrafluorides. They show a complicated non rigid behaviour.