Processes may include producing at least one alkoxyhydroxybenzaldehyde compound from at least one hydroxyphenol compound, wherein processes include the steps of: (i) synthetizing at least one alkoxyphenol from said at least one hydroxyphenol in the presence of at least one O-alkylating agent; (ii) recovering said at least one alkoxyphenol and impurities, wherein said impurities includes a dialkoxybenzene compound; (iii) separating said dialkoxybenzene from the alkoxyphenol; (iv) condensing the alkoxyphenol with glyoxylic acid and obtaining the corresponding mandelic compound; (v) oxidizing said mandelic compound to give the corresponding alkoxyhydroxy-benzaldehyde; and (vi) recovering said alkoxyhydroxybenzaldehyde.