| 摘要 |
In the preparation of 2-stilbyl-(naptho-11.21:4.5) -1 : 2 : 3-triazoles by the process of the parent Specification, the handling of 2-aminonaphthalene in the first step is avoided by employing as coupling component a sulphonated derivative of 2-aminonaphthalene, coupling in the 1-position, from which the sulphonic acid group or the radical carrying it is split off at a suitable stage in the dyestuff or triazole formation. As coupling components from which the sulphonic acid group is split off during coupling may be used 2-aminonaphthalene-1-sulphonic acid or 2-naphthylsulphamic acid, which, owing to their relatively slight coupling power, are advantageously coupled at a higher temperature than is usual (e.g. at 40-60 DEG C.), in the presence of additives which stabilize the diazo compound (e.g. naphthalene-mono- and di-sulphonic acids or tetrahydronaphthalenesulphonic acids). Alternatively there may be used N-2-naphthylmethylamine - o - sulphonic acid, from which the sulphomethyl radical is subsequently split off, advantageously by alkaline hydrolysis before the oxidation step, or such 2-aminonaphthalenesulphonic acids, coupling in the 1-position, the sulphonic acid group of which can be split off by mineral acid hydrolysis of either the aminoazo dyestuff or the triazole. Examples describe the use of the three coupling components specified above, the diazo component in each case being 4-aminostilbene-2-sulphonic acid and the o-aminoazo dyestuff being oxidized with sodium hypochlorite to 2-(stilbyl -411) - (naphtho - 11.21:4.5) - 1.2.3 - triazol -211-sulphonic acid.ALSO:In the process of the Parent Specification, the handling of 2-aminonaphthalene is avoided by coupling the diazotized 4-aminostilbene-2-sulphonic acid with a sulphonated derivative of 2-aminonaphthalene, coupling in the 1-position, from which the sulphonic acid group or the radical carrying it is simultaneously or subsequently split off. As coupling components from which the sulphonic acid group is split off during coupling may be used 2-aminonaphthalene-1-sulphonic acid or 2-naphthylsulphonic acid, which, owing to their relatively slight coupling power, are advantageously coupled at a higher temperature than is usual (e.g. at 40-60 DEG C.), in the presence of additives which stabilize the diazo compound (e.g. naphthalene-mono- and di-sulphonic acids or tetrahydronaphthalenesulphonic acids). Alternatively there may be used N-2-naphthylmethylamine - o - sulphonic acid, from which the sulphomethyl radical is subsequently split off, advantageously by alkaline hydrolysis, or such 2-aminonaphthalenesulphonic acids, coupling in the 1-position, the sulphonic acid group of which can be split off by mineral acid hydrolysis. Examples describe the use of the three coupling components specified above. |
