| 摘要 |
<p>PURPOSE:To obtain the subject compound in high yield and selectivity with excellent stability under relatively mild conditions in a short time by reacting an aldehyde with formaldehyde by using a primary or a secondary amine salt having a buffering ability as a catalyst. CONSTITUTION:An aldehyde (e.g. propionaldehyde) expressed by the formula (R1 is H, 1-10C alkyl or aryl) is reacted with formaldehyde under conditions of 20-150 deg.C and 0.1-50atm within the range of pH2.5-12.0 by using a primary or a secondary amine salt such as oxalic acid amine salt obtained from, e.g. oxalic acid dihydrate, diethanolamine and water as a catalyst in an amount of 0.01-10.0 equiv. based on 1mol aldehyde expressed by the formula to afford an alpha-alkylacrolein (e.g. methacrolein). A salt of a primary or a secondary amine with an organic or an inorganic acid having a relatively weak acidity is representative of the buffer substance that is the catalyst. Boric acid, a carbonic acid derivative, etc., can be used and the catalyst is economical and entirely new without any problems in environment.</p> |
