Vinylidene group

Vinylidene chloride and fluoride can be converted to linear polymers polyvinylidene chloride (PVDC) and polyvinylidene fluoride (PVDF).

The polymerization reaction is: These vinylidene polymers are isomeric with those produced from vinylene monomers.

Although vinylidenes are only transient species, they are found as ligands in organometallic chemistry.

The complex chloro(cyclopentadienyl)bis(triphenylphosphine)ruthenium readily forms such complexes:[1] Featuring divalent carbon, vinylidenes are unusual species in organic chemistry.

They are unstable as solids or liquids but can be generated as stable dilute gases.

Structure of the DDT-derived vinylidene complex Fe(TPP)C 2 (C 6 H 4 Cl) 2 , one of several iron carbenoid complexes prepared by Mansuy (TPP = conjugate base of tetraphenylporphyrin ). [ 2 ]