| 摘要 |
PURPOSE:To prepare the titled compound economically in high purity, by reacting isobutylbenzene with acetaldehyde in the presence of sulfuric acid catalyst to give a novel compound, catalytically decomposing the resultant compound to afford p-isobutylstyrene, and reacting H2 and CO therewith in the presence of a carbonylation catalyst. CONSTITUTION:Isobutylbenzene is reacted with acetaldehyde in the presence of sulfuric acid catalyst to give novel 1,1-bis(p-isobutylphenyl)ethane, which is then catalytically decomposed in the presence of a protonic acid and/or solid acid catalyst at 200-650 deg.C to give isobutylbenzene (reutilized as a starting material) and p-isobuthylstyrene. The resultant p-isobuthylstyrene is then reacted with hydrogen and CO in the presence of a carbonylation catalyst at 40-150 deg.C to give the aimed compound. EFFECT:The raw material is safe, stable and inexpensive, and the preparation is carried out only in three steps with simple operation. USE:A precursor for alpha-(p-isobutylphenyl)propionic acid. |
