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Hydroxybenzaldehydes (HBAs) are ubiquitous in reaction mixtures obtained from various types of lignin degradation, particularly oxidative degradation. This article reviews the formation behaviors, pathways, and mechanisms of HBAs during alkaline nitrobenzene and alkaline aerobic oxidations of lignin. The former is a well-known analytical method for lignin, while the latter is of industrial importance from the viewpoint of the production of bio-based aromatics.
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Hosoya et al. (2023) studied this question.
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