| 摘要 |
<p>: In the preparation of alkylene carbonates having alkyl, aryl, cycloalkyl and aralkyl substituents, the corresponding alkylene oxides are reacted with carbon dioxide, the catalyst being a combination of a protic substance having the formula ROH, wherein R is either hydrogen or a radical as enumerated above, with a nitrogeneous basic substance selected from the group constituted by dimethylaniline, triethylamine, pyridine and a basic nitrogeneous resin which is insoluble in the reaction medium. The minor component (by weight) of catalyst being present in the range from 0.1% to 30% by weight of the alkylene oxide. The reaction is carried out at temperatures ranging from 0.degree.C to 200.degree.C and under a pressure comprised between 1 and 100 atmospheres.</p> |
