| 摘要 |
<p>Process for the preparation of Schiff's bases by the reaction of aromatic amines with ketones Schiff's bases of the formula are obtained by reacting an amine H2N-R3 with a ketone in presence of calcium hydrogen phosphate, apatite, aluminum oxide, aluminium hydroxide and/or Fuller's Earth and subsequent removing the water by azeotronic distillation. The products are intermediates for the preparation of phenylene diamines which may be used as age resistos for rubber. Le A 19 395</p> |
