Fluoroacetone (Ⅰ) has been prepared through dimethyl cadmium and fluoroacetyl chloride with promising yield of 84%.a-Fluoromethacrylonitrile (Ⅳ),a-fluoromethacrylamide (Ⅷ) and methyl a-fluoromethacrylate (Ⅶ) have been synthesized and characterized.All these three new monomers polymerize readily and the polymers obtained have much higher softening points than the corresponding a-methyl-vinyl compounds.According to our preliminary observations,the excellent high softening points (about 250°C),freedom from color and glass-like clarity,the methyl a-fluoromethacrylate polymers may make them in demand for high-quality glasses for high-speed aeroplane.