| 摘要 |
An azo compound useful in copying processes of the formula <IMAGE> (I) where R1 is hydrogen or alkyl of 1 to 4 carbon atoms, R2 and R3 are each alkyl of 1 to 4 carbon atoms, or one of the radicals R1, R2 and R3 is unsubstituted phenyl or phenyl substituted by alkyl of 1 to 4 carbon atoms, methoxy or ethoxy, and A denotes <IMAGE> where R4 and R5 are each hydrogen; alkyl of 1 to 8 carbon atoms which may be substituted by hydroxy, alkoxy, halogen or alkoxycarbonyl; cyanoethyl; alkylcarbonyl with 1 to 3 carbon atoms in the alkyl; cyclohexyl; phenalkyl of 7 to 10 carbon atoms; or substituted or unsubstituted phenyl, or R4 is N,N-dialkylaminoalkyl or N,N-bisphenalkylaminoalkyl, or the group <IMAGE> is a 5-membered or 6-membered saturated heterocyclic ring which may contain an -O- or -S- group as ring member, Y is hydroxy, alkyl, alkoxy, chlorine, bromine or alkylcarbonylamino, n is 0, 1 or 2, R6 and R7 are each hydrogen, alkyl of 1 to 4 carbon atoms, cyclohexyl or unsubstituted phenyl or phenyl substituted by alkyl or alkoxy, and Z is hydrogen, hydroxy, methoxy, ethoxy or a sulfonic acid group. The light absorption of the yellow to orange colored compounds (I) is displaced, upon protonation of the compounds, by 150 to 200 nm toward the longer wavelength range, i.e. the salts are violet to blue in color.
|
