| 摘要 |
PROBLEM TO BE SOLVED: To readily and simply obtain an asymmetrical chain carbonic acid ester, by subjecting two kinds of symmetrical chain carbonic acid esters to a disproportionate reaction in the presence of a specific catalyst. SOLUTION: Two kinds of symmetrical chain carbonic acid esters are catalytically subjected to a disproportionate reaction by using a catalyst comprising an oxide of at least one element selected from elements of the group IIIB (e.g. Sm or Y) as a catalytically active component to give the objective asymmetrical chain carbonic acid ester. Dimethyl carbonate and diethyl carbonate may be cited as the two kinds of symmetrical chain carbonic acid esters. Ethyl methyl carbonate is cited as the objective ester. The asymmetrical chain carbonic acid ester is useful as a solvent, a reagent for various organic syntheses and especially a solvent for a secondary battery of lithium ion. The reaction having high selectivity free from a by-product can be carried out by using the solid catalyst which is highly active, stable and readily handleable and the treatment after the reaction can be simplified. |
