| 摘要 |
In the reduction process of the parent Specification the naphthoquinone promoter is replaced by one of the following: a - or b -naphthol, a dihydroxynaphthalene or aminonaphthol (including alkylamino, phenylamino and acylamino naphthols) in which the two substituents are in quinone-forming positions or 1 : 8 positions, 5-amino-2-naphthol, 2-naphthol - 4 - sulphonic acid, or 2 : 3 - oxynaphthoic acid. The reaction conditions are as in the parent Specification. In the examples, in which the reducing agent is sodium methoxide, the naphthols used as promoters are: 1 : 4-dihydroxynaphthalene, 4 - amino - 1 - naphthol, 2 - amino - 1 - naphthol, 1 - amino - 2 - naphthol, 1 - amino - 2 - naphthol - 4 - sulphonic acid, 2-naphthol - 4 - sulphonic acid a - naphthol, 1-amino - 8 - naphthol, 1 : 8 - dihydroxynaphthalene, b - naphthol, 5 - amino - 2 - naphthol and 2 : 3-oxynaphthoic acid. The products obtained are azobenzene, azoxybenzene and hydrazobenzene. Besides nitrobenzene the following may be reduced: o- and m-nitrotoluenes, o - and m - nitrochlorobenzenes, o-nitroanisole, o - nitrophenetole, o - nitrobenzoic acid and o - nitrobenzenesulphonic acid. Other specified naphthol promoters are 4-amino - 1 - naphthol - 2 - sulphonic acid, 2 : 3-dihydroxynaphthalene, 2 : 3 - dihydroxynaphthalene - 6 - sulphonic acid and 4-anilino-1-naphthol. |
