| 摘要 |
<p>The a -naphthyl ester of 2-diazo-naphthol-(1)-5-sulphonic acid is obtained by adding aqueous sodium carbonate to a solution of a -naphthol and 2 - diazo - naphthol - (1) - 5 - sulphonic acid chloride in dioxane at room temperature, heating and rendering the cooled solution alkaline with caustic soda. The condensation product of 2 mols of 2-diazo-naphthol-(1)-5-sulphonic acid and 1 mol of 2 : 21-dihydroxy-1 : 11-dinaphthylmethane can be obtained in a similar manner. The 71 - hydroxy - 2 - ethyl - N - (n - propyl)-naphtho - 11 : 21 : 4 - 5 - imidazole ester of 2-diazo - naphthol - (1) - 4 - sulphonic acid is made by adding aqueous sodium carbonate to 71 - hydroxy - 2 - ethyl - N - (n - propyl)-naphtho - 11 : 21 : 4 : 5 - imidazole in dioxane and water, followed at 30 DEG to 35 DEG C., by a warm solution of 2-diazo-naphthol-(1)-4-sulphochloride in dioxane. 2 - Diazo - naphthol - (1) - 5 - sulphonic acid-p-xylidide may be obtained by reacting 2-diazo - naphthol - (1) - 5 - sulphochloride with 2 : 5-dimethylaniline in the presence of an acid binding agent. 71 - Hydroxy - 2 - ethyl - 1 (or 3) - (n - propyl)-naphtho - 11 : 21 : 4 : 5 - imidazole is obtained by boiling an aqueous solution of 1 mol. of 1 : 2 - diaminonaphthalene - 7 - sulphonic acid and 2 mols. of n-propionaldehyde, filtering the precipitated 2-ethyl-N-(n-propyl)-naphtho-11 : 21 : 4 : 5 - imidazole - 71 - sulphonic aci and fusing it with caustic potash. Specifications 371,153, 450,817 and 707,378, [all in Group XX], are referred to.</p> |
