![]() ![]() Commonly, carbon–carbon coupling (C–C) reactions (aldol condensation, 3,4 hydroxyl alkylation/alkylation, 5 benzoic acid condensation, 6 Robinson cyclization reaction 7 and Diels–Alder reaction, 8,9 etc.) are used to obtain the desired product, which has important use value for human life. Therefore, it is necessary to increase the carbon chain of biomass platform compounds to increase their use value. The carbon number of compounds in biomass-based materials is generally C 5–C 6, which is much lower than the carbon number requirements of diesel and aviation kerosene. However, with the increasing attention on renewable energy and sustainable development, the catalytic conversion of renewable, cheap and inedible lignocellulose into renewable fuels 1,2 has attracted the attention of many scholars. For a long time in the future, fossil fuels will still be used by humans as the main energy source. Introduction Fossil fuel is one of the main energy sources in the world. In the future application of aldol condensation, the development of strong alkaline resin is a good research direction. Ionic liquid is a new type of material, which can also be used for the aldol condensation reaction. Acid–base amphoteric catalysts have received extensive attention from researchers for their excellent activity and selectivity. The basic resin has good catalytic activity and at a low reaction temperature, and is easy to separate from the target product. The reaction temperature needed for oxide and hydrotalcite alkali is relatively high. The basic catalyst catalyzes the aldol condensation reaction with high conversion and yield, but the existence of liquid alkali is difficult to separate from the product. ![]() The aldol condensation reaction catalyzed by an acid catalyst has the problems of low conversion and low yield. In summary, an acidic catalyst, alkaline catalyst, acid–base amphoteric catalyst, ionic liquid and other catalysts can catalyze the aldol condensation reaction. Research progress of catalysts of the aldol condensation reaction of biomass based compounds is summarized for the synthesis of liquid fuel precursors and chemicals. ![]()
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