| 摘要 |
<p>Preparation of asymmetric bisisoindoline pigments of the general formula I <IMAGE> in which A and B are radicals of different methylene-active compounds, oxygen or sulphur, L is a divalent radical or a chemical bond, and the rings D are identical or different and unsubstituted or substituted, by a) reacting a semicondensate of the formula IIa <IMAGE> with a compound of the formula III H2N-L-NH2 III in an inert organic solvent and b) reacting the compound of the formula IV <IMAGE> obtained in step a), directly or after isolation, with a semicondensate of the formula IIb <IMAGE> in the presence of an acid and in the presence or absence of an inert organic solvent.</p> |
