| abstract |
ANTHRAQUINONE DYESTUFFS OF THE FORMULA A-(NH-C(-R1)=C(-CN)-R2)N IN WHICH A IS SUBSTITUTED OR UNSUBSTITUTED ANTHRAQUINONE RADICAL; R1 IS H, SUBSTITUTED OR UNSUBSTITUTED HYDROCARBON; R2 IS CN OR A CARBOXYLIC ACID ESTER RADICAL; AND N IS A NUMBER FROM 1 TO 4; AND THEIR PREPARATION BY CONDENSATION OF N-ANTHRAQUINONYL-N''-AMIDINIUM SALTS WITH CYANOACETIC ACID ESTGERS OR MALONIC DINITRILE IN THE PRESENCE OF ACID-BINDING AGENTS, E.G. ALKALI METAL OXIDE, HYDROXIDES CARBONATES, ARE DISCLOSED. |