- Preparation method of 3,5-dimethoxy-4-methyl benzoic acid
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The invention discloses a preparation method of 3,5-dimethoxy-4-methyl benzoic acid, which comprises the following steps: adding methyl 4-methyl benzoate in a first organic solvent, adding bromine, and carrying out bromination reaction to obtain methyl 3,
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Paragraph 0035-0038; 0043-0046
(2021/05/29)
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- Process for aromatic ethers
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A process for the preparation of aromatic ethers by the bromination of a compound of the formula STR1 wherein R1, independently, is hydrogen, hydroxy, lower alkoxy, lower alkyl; m is an integer from 1-4, and A is --CHO, --COOR3 or lower alkyl, and subsequently treating the reaction product of the bromination step with an alkali metal alkoxide in the presence of cuprous halide or oxide, is described.
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