Abstract(2‐Chloroethyl)oxirane, (3‐chloropropyl)oxirane, and (4‐chlorobutyl)oxirane were prepared from the corresponding alkenols and polymerized using a triethylaluminum‐water‐acetylacetone initiator system. Copolymerizations with propylene oxide and epichlorohydrin were also accomplished; the copolymerization activities of the (chloroalkyl)oxiranes were similar to the activity of epichlorohydrin. Poly[(2‐chloroethyl)oxirane], poly[(3‐chloropropyl)oxirane], and poly[(4‐chlorobutyl)oxirane] exhibit elastomeric properties and are highly reactive in nucleophilic substit