| 摘要 |
The invention relates to a process for preparing 2,4-dihydroxyphenyl 4-methoxybenzyl ketones of the formula (I) by Friedel-Crafts acylation in hydrogen fluoride (HF). 2,4-Dihydroxyphenyl 4-methoxybenzyl ketones of the formula (I) in which R1 and R2 are each hydrogen, chlorine, fluorine, bromine, iodine, CF3, methyl, optionally substituted alkoxy, —OCF3, —C(CH3)3, —CH2(CH3)2, —CH(CH3)2, R3 is hydrogen, Cl, F, Br, optionally substituted alkyl, optionally substituted alkoxy, —C(CH3)3, and X is hydroxyl, F, Cl, Br, optionally substituted alkoxy, are obtained in high yield and high purity by reacting phenylacetic acid derivatives of the formula (II) with phenols of the formula (III) in liquid hydrogen fluoride (HF).
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