Hydrogen iodide → 2-(4-Hydroxyphenyl)propionic acid

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Also, the compounds (III) used for this invention, for example, 2-(3-nitro-4-hydroxyphenyl)propionate can be prepared by demethylating 2-(4-methoxyphenyl)propionic acid with hydroiodic acid and the like to obtain 2-(4-hydroxyphenyl)- propionic acid, by esterifying the above compound with an usual method to obtain, for example, methyl 2-(4-hydroxyphenyl)propionate and by nitrating the above compounds. Alternately, 2-(3-nitro-4-hydroxyphenyl)propionate can be prepared by nitrating the above 2-(4-hydroxyphenyl)propionic acid with an usual method and by esterificating the resultant compound. The above reactions can be applied to 4-hydroxyphenylacetate as well. The above reaction scheme is shown as follows: ##STR12## wherein R1 has the same meaning as above

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