Methyl and ethyl 2-acryloxyacrylate (Va，Vb)and ethyl 2-methacryloxyacrylate(Vc) have been synthesized and polymerized to linear cyclopolymers．The monomers were synthesized through：(1) acylation of 2-hydroxy-3-chloropropionic esters with 3-chloro-propionyl chloride or 2-methyl-3-chloropropionyl chloride to obtain correspondingly methyl and ethyl 2-(3’-chloropropioxy)-3-chloropropionate(IVa，IVb)and ethyl 2-(2’-methyl-3’-chloropropioxy)-3-chloropropionate(IVc)，and (2) dehydrochlorination of the acylated compounds (IV) with triethylamine to obtain the desired monomers (V)．By considering the solubilities，chemical analysis of the double bonds，and infrared spectra of the poly-mers，we proposed that these monomers (V) were polymerized chiefly according to the cyclopolvmerization mechanism．