Process for the preparation of 1-substituted anthraquinones

摘要

A process for the preparation of 1-substituted anthraquinones represented by the general formula I HOX ¦ PARALLEL ¦ R2CCCH ¦ ANGLE ANGLE ANGLE ¦ CCCC ¦ PARALLEL PARALLEL ¦ (I) CCCC ¦ ANGLE ANGLE ANGLE ¦ R1CCCH ¦ PARALLEL ¦ HOH where, in the formula, R1 and R2 represent individually a hydrogen atom or methyl group and X represents a hydroxylamino or amino group, WHICH COMPRISES TREATING IN A LIQUID MEDIUM A 5-NITRO-1,4,4A,9A-TETRAHYDROANTHRAQUINONE REPRESENTED BY THE GENERAL FORMULA II HHONO2 ANGLE PARALLEL ¦ R2CHCCH ¦ ANGLE ¦ ANGLE ANGLE ¦ CCCC PARALLEL ¦ PARALLEL ¦ (II) CCCC ¦ ANGLE ¦ ANGLE ANGLE ¦ R1CHCCH ANGLE PARALLEL ¦ HHOH where, in the general formula, R1 and R2 represent individually a hydrogen atom or methyl group, IN THE PRESENCE OF A BASIC COMPOUND WITH OR WITHOUT A REDUCING AGENT.