3-Chloro-2-fluoropropene, a new reactive intermediate, was prepared by chlorination of 2- fluoropropene under a variety of conditions where an ionic mechanism predominated, but not under radical conditions. 3-Amino-2-fluoropropeneI 2-fluoro-3-iodopropene, 2-fluoro- 2propeno1, and 2-fluoro-2-propenyl ethyl ether were prepared to demonstrate the reactivity. 3-Chloro-2-fluoropropene can be copolymerized to low polymers with acrylonitrile and ...