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摘要

6-Dimethylaminomethyl - 2 - methoxy-4-nitrophenol is prepared by adding aqueous formaldehyde to a refluxing mixture of 2-methoxy-4-nitrophenol in ethanol and aqueous dimethylamine. The product may be reduced to 4 - amino - 2 - methoxy-6-methyl-phenol hydrochloride by dissolving in ethanol and hydrochloric acid and hydrogenating with palladium on barium sulphate catalyst. 6-Dimethylaminomethyl-2-ethoxy-phenol is similarly prepared from o-ethoxyphenol, and is reduced to 2-ethoxy-6-methyl-phenol using a copper chromite catalyst or palladium on barium sulphate catalyst. 4-Amino-2-ethoxy-6-methyl-phenol is prepared by coupling diazotized sulphanilic acid with 2-ethoxy-6-methyl-phenol and reducing the azo dye formed with sodium hydrosulphite. The following compounds are similarly prepared from the appropriate phenol; 4-amino-2-methoxyphenol, 4-amino-2-ethoxy-phenol, 4-amino-2-propoxyphenol, 4-amino - 2 - butoxy-phenol, 4-amino-2,6-dimethylphenol, 4-amino-2-methyl-6-propylphenol and 4-amino-2,6-dimethoxyphenol. Alternatively, 2,5-dichloroaniline may be used instead of sulphanilic acid. Specifications 684,592, 714,412, and U.S.A. Specifications 2,634,886, 2,698,237, 2,698,244 and 2,823,122 are referred to.ALSO:Azo dyes are prepared by coupling diazotized sulphanilic acid or 2:5-dichloro aniline with phenols having alkyl or alkoxy groups in the 2- and/or 6-positions. They are used as intermediates for p-aminophenols which they yield on reduction (see Group IV(b)). Specifications Specifications 684,592, 714,412 and U.S.A. Specifications 2,634,886, 2,698,237, 2,698,244 and 2,823,122 are referred to.