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Methylenesulfurtetrafluoride, CH2=SF4, Formation, Structure, and Chemistry
Kleemann, Gert,Seppelt, Konrad
, p. 645 - 658 (2007/10/02)
The preparation of methylenesulfurtetrafluoride, CH2=SF4, is achieved by bromine-lithium exchange on Br-CH2-SF5 at low temperatures and subsequent lithium fluoride elimination.CH2=SF4 is a colourless gas with b.p. -19 deg C and m.p. -139 deg C.The structure is essentially trigonal-bipyramidal, the methylene group occupying an equatorial position.The protons lie in the plane of the axial fluorine atoms.The molecule is rigid.The carbon-sulfur bond is best described as strong double bond with only little ylidic polarity. - The double bond undergoes numerous addition reactions with polar species under formation of cis-configurated X-CH2-SF4-Y systems.Less often elimination of SF4 and formation of carbene is observed.
