| 摘要 |
PURPOSE:The catalytic reaction of succinic anhydride with formaldehyde, both of which are readily and inexpensively available, is conducted in the presence of a catalyst of activated alumina, which also is readily available, under heating to produce titled compound, a starting material of synthetic resin, in high yield. CONSTITUTION:The catalytic reaction between succinic anhydride or ester and formaldehyde is effected in the presence of a catalyst of activated alumina or molybdenum oxide on activated alumina (the content of the molybudenum oxide is 0.5-30wt% calculated as MoO3 and the catalyst is more active than alumina alone) at 300-500, preferably 300-400 deg.C to produce citraconic acid or its derivative. As the starting material for formaldehyde, its aqueous solution, a solution of paraformaldehyde in methanol or trioxane can be used. The ratio of the succinic derivative to formaldehyde is preferably 1:1-1:10. USE:A starting material of itaconic acid. |
