Abstract Previously unknown 2-methacryloyl-5-hydroxy-3, 3, 5-trimethylisoxazolidine was prepared by the reaction of 5-hydroxy-3, 3, 5-trimethylisoxazolidine with methacryloyl chloride. Homopolymers of this compound and its copolymers with N-vinylformamide and N- vinylpyrrolidone were obtained by radical polymerization.