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Lasa Laboratorios SA
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Lasa Laboratorios SA
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Application filed by Lasa Laboratorios SAfiledCriticalLasa Laboratorios SA
Priority to ES526614ApriorityCriticalpatent/ES8600221A1/en
Publication of ES526614A0publicationCriticalpatent/ES526614A0/en
Publication of ES8600221A1publicationCriticalpatent/ES8600221A1/en
The azo cpds. of formula (I), in which R1 is an inorganic cation Na, K, Ca or Al, or organic gp. such as lysine, glucamine, methyl glucamine and glucosamine, and R2 is H or -COCH3, are made by (a) reacting opt. acetylated 5,5'-azo disalicylic acid with an equiv. amt. of organic or inorganic base such as sodium, potassium, calcium or aluminium hydroxides in aq. medium under reflux and (b) sepg. the salt by salting out or mixing the conc. aq. soln. of the salt with a miscible organic solvent.
1,10-phenantrolinates of sodium or potassium 4-nitrophenyl-pyridinyl methanides having indicating properties to water or protonic organic solvents with interval of transition from blue to colorless at pk of 29