| 摘要 |
PURPOSE: To obtain an imino compound which is useful as an intermediate for pigments by using a solvent incompatible with urea to effect the reaction, as the phase separation is maintained during the reaction through a simplified process without use of reactants difficult to handle. CONSTITUTION: When this imino compound of formula I (A<1> is O, NH; Z is an aromatic or heterocyclic group which clan form a conjugated system with >C=NH) is obtained by reaction of a compound of formula II (A<2> is O, NH) with urea in the presence of a catalyst in an solvent, a solvent incompatible with urea is used to carry out the reaction, as the phase separation between the solvent and the urea is maintained. It is preferred that an aliphatic hydrocarbon solvent, an aromatic hydrocarbon solvent, a chlorinated hydrocarbon solvent, an alcoholic solvent, an ether solvent, a ketone solvent, an ester solvent or a nitrogen atom-containing solvent, e.g. nitrobenzene is used as this solvent. |
