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The application of biopolymer-based catalyst in catalysis is attracting more and more attention in the field of chemistry. Lignosulfonic acid (LSA), which is an organic waste generated as a byproduct from the pulp and papermaking industry, could serve as a retrievable sustainable heterogeneous catalyst for multicomponent reactions under solvent-free conditions, such as one-pot synthesis of benzoxanthenes by a condensation reaction of dimedone with aldehyde and 2-naphthol in excellent yields. Furthermore, the as-synthesized solid acid catalyst could be used for several cycles without significant loss of catalytic activity. These results clearly show that the lignin-derived catalyst is economic, eco-friendly, and promising for green chemical reactions from low-cost feedstocks and may find wide applications.
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Chen et al. (2015) studied this question.
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