Catalyst-free fixation of carbon dioxide into value-added chemicals: a review

摘要: In the context of global warming and future circular economy, chemical fixation carbon dioxide (CO2) is a fast-developing research area because gaseous CO2 could be trapped converted into value-added products, industrial chemicals pharmaceuticals. The latest advancements focus on homogeneous heterogeneous catalysts, yet drawbacks high price, complicated design difficult recovery need to circumvented. Although catalyst-free concept has been extensively used in synthetic chemistry, this paradigm remains underexplored domain conversion. Therefore, here we review photochemical for manufacture products such as ureas, carbamates, oxazolidinones, quinazoline-2,4(1H,3H)-diones, benzimidazoles, 1,6-dioxospiro/1,6-dioxaspiro derivatives, polymers, N-formamides, N-methylamines carboxylic acids. Noteworthy, conversion can accomplished water or solvent-less conditions. We also discuss reaction mechanisms leading formation CO2-derived absence any catalyst additives.