| abstract |
Isoquinolines, useful as starting materials for dyes and as fluorescent agents for marking mineral oils, of formula (I): (where R1, R2 and R3 each are an (ar- or cyclo)aliphatic or aromatic gp. and R1 can also denote H, halogen or -N(R4)2 where each R4 is an (ar)aliphatic or aromatic gp. or H) are prepared by reacting homophthalic acid cpds. (II) (where R5 is -COOH, -CN or -CONH2, R6 is -COOH, and R5 and R6 each can denote -COOR7 where R7 is an (ar- or cyclo) aliphatic or aromatic gp. or together they can form gp. -OC-O-CO-) with diamines H2N-R2NH-R3 (III) at 100-220 degrees C. Pref. R1, R2 and R3 each are 1-6C alkyl(ene) 7-12C aralkyl(ene), 5-8C cyclalkyl(ene), phenyl(ene) or naphthyl(ene), R1 also denotes H, Cl or -N(R4)2, where each R4 is 1-6C alkyl, 2-5C aliphatic acyl, benzyl benzoyl, phenyl or H. |