Polylactones. 10. Cationic polymerization of .delta.-valerolactone by means of alkylating reagents

Reaction entre 20 et 50°C, dans le nitrobenzene en presence de tosylate de methyle, methane sulfonate de methyle, sulfate de methyle, triflate de methyle, fluorosulfate d'ethyle ou fluoroborate de triethyloxonium