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Vinyl halides are very useful synthetic intermediates due to the vast number of reactions that make use of them. These include conversion to vinyl Grignard reagents, elimination to give the corresponding alkyne, and most importantly their use in cross-coupling reactions (e.g. Suzuki-Miyaura coupling, Stille coupling, Heck coupling, etc.).
Besides, some vinyl halides are useful for synthesizing polymers and copolymers, see e.g. polyvinyl chloride or polyvinyl fluoride. The unsubstituted vinyl halides (R1 = R2 = R3 = H) may polymerize spontaneously under certain conditions.
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