METHOD OF PRODUCING CYCLOPENTENCHARBONATE BY CATALYTIC CARBOXYLATION OF 1,2-EPOXYCYCLOPENTANE Russian patent published in 2017 - IPC C07D317/44 C07C69/13 C07C68/04 

FIELD: chemistry.

SUBSTANCE: method for the preparation of cyclopentenecarbonate by the reaction of catalytic carboxylation of 1,2-epoxycyclopentane under a constant pressure of carbon dioxide of 1.0-4.5 MPa and a temperature of 110-160°C, a binary catalyst system consisting of quaternary ammonium salt-TEAB or TBAB and crystalline hydrate of chloride, Co or Ni bromide with a molar ratio of metal halide/quaternary ammonium salt (0.125-2)/1, is used as a catalyst for 1.5-4.0 hours. During this time, selectivity to cyclopentenecarbonate is achieved not lower than 98-99% with almost complete conversion of epoxide. An additional distinctive feature of the known ones is the possibility of carrying out the reaction in the presence of a solvent, which uses the desired cyclopentenecarbonate, N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, wherein the mass fraction of 1,2-epoxycyclopentane in the starting mixture of 10-80%.

EFFECT: reducing the reaction time without reducing the yield of the desired product.

2 cl, 3 ex