| 摘要 |
<p>PURPOSE:To obtain a compound useful as an intermediate for dye for heat- sensitive and pressure-sensitive papers, xanthene based dye, etc., in high quality and yield, by subjecting aminophenols to reduction and alkylation reaction with acetaldehyde. CONSTITUTION:Aminophenols are subjected to reduction and alkylation reaction with acetaldehyde in a solvent such as methanol in the presence of a catalyst (e.g. platinum) under hydrogen pressure at ordinary temperature - 150 deg.C. Then unreacted acetaldehyde and solvent are removed while maintaining distillation temperature to >=160 deg.C from the reaction liquid obtained by separating the catalyst. Then the distillation liquid is distilled while maintaining the liquid to <=200 deg.C to provide the aimed product. The reaction is carried out using 2.1-4 times mol. acetaldehyde based on 1mol. aminophenols. The aimed compound is advantageously obtained without accompanying problem such as corrosion on material, large amount of drainage and generation of sludge.</p> |
