| 摘要 |
1458753 Aromatic hydroxyl amines RHONEPOULENC SA 20 Nov 1974 [21 Nov 1973] 50321/74 Heading C2C Aromatic hydroxyl amines of the general formula in which each of R<SP>1</SP>, R<SP>2</SP>, R<SP>3</SP>, R<SP>4</SP> and R<SP>5</SP> independently represents a hydrogen atom, a straight or branched alkyl radical, a cycloalkyl radical or a phenyl, phenylalkyl or alkylphenyl radical, or two adjacent R radicals together with the two carbon atoms of the benzene ring to which they are attached, form a benzene ring which forms an ortho-condensed system with the benzene ring shown, are prepared by hydrogenating an aromatic nitro derivative of the formula in the presence of a platinum catalyst and a nitrogen-containing organic base of pK B at least 3À2, which is an N-alkyl piperidine which is optionally substituted by one or more alkyl groups, a pyrrolidine which is optionally substituted on the nitrogen atom and/or on the carbon atoms of the ring by one or more alkyl groups, an N-alkyl or N-cycloalkyl aniline which is optionally substituted by one or more alkyl groups, pyridine, an alkyl-pyridine, quinoline or isoquinoline, the ratio by weight of the nitrogen-containing organic base to the nitro compound being at least 0À1. |
