The 2,3,5-trimethoxyphenylacetic acid was prepared from the corresponding 2,3,5-trimethoxybenzaldehyde.The trimethoxyphenylacetic acid obtained from derritol methyl ether was converted into its ethyl ester, which yielded the diphenylcarbinol by the Grignard reaction. This carbinol was dehydrated to the corresponding trimethoxyphenyldiphenylethylene, which was oxidized to a trimethoxybenzoic acid. This acid proved to be identical with 2,4,5-trimethoxybenzoic acid (asaronic acid).The same acid was obtained by direct oxidation of derritol methyl ether and derritol itself yielded a dimethoxyhydroxybenzoic acid.
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