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1,1-Difluoroethylene also known as vinylidene fluoride, is a compound of the haloalkenes group. It is colorless gas that can be easily set on fire at typical temperature and pressure. it is a hydrofluoroolefin. Global production in 1999 was approximately 33,000 metric tons. It is primarily used in the production of fluoropolymers such as polyvinylidene fluoride.

Preparation
1,1-Difluoroethylene can be prepared using various methods. One of the methods is to get rid of Hydrogen chloride from 1-chloro-1,1-difluoroethane.



Another method is to remove Hydrogen fluoride from 1,1,1-trifluoroethane.



Hazard
1,1-Difluoroethylene can cause serious irritation. It can become vapor at normal temperature and pressure. Moreover, the change in pressure and temperature of the surrounding can leads to the rapid change in chemical.

NMR spectrum
By looking at Proton nuclear magnetic resonance, it shows that there is one peak presents because of the two hydrogen atoms are chemically equivalent.