| 摘要 |
PURPOSE:To obtain an unsaturated carboxylic acid diester having branched alkyl group in high efficiency by reacting maleic acid or fumaric acid or their monoester with isobutene in the presence of an acid catalyst using various ethers as the reaction solvent. CONSTITUTION:An unsaturated carboxylic acid diester (e.g. di-tert-butyl fumarate) can be produced by reacting (A) fumaric acid, maleic acid or monoester of maleic acid or fumaric acid expressed by formula I (R is alkyl, alkenyl, cycloalkyl, cycloalkenyl, aryl or siloxanyl) with (B) isobutene in the presence of an acid catalyst in a reaction solvent of formula II (R1 and R2 are 1-8C alkyl, 3-8C cycloalkyl or aryl) (e.g. dimethyl ether, methyl cyclopentyl ether or phenyl methyl ester). Since there is no production of water as a by- product, the process is advantageous. |
