Improvement in the synthesis of vinylene carbonate

Vinylene carbonate was synthesized by elimination reaction of monochloro-ethylene carbonate in a strong polar solvent ethylene carbonate.Under this condition,the yield of vinylene carbonate was 50%,and the reaction time was dramatically reduced from 39 h to 1 h.The monochloro-ethylene carbonate and vinylene carbonate were characterized by FTIR,GC-MS and ~1HNMR respectively.