The shortage of oil resources is currently a global problem. The use of renewable resources instead of non-renewable ones has become a hot topic of research in the eyes of scientists. In the food industry, there is a lot of interest in bio-based smart active packaging that meets the concept of sustainability and ensures safety. The packaging has antibacterial and antioxidant properties that extend the shelf life of food. Its ability to monitor the freshness of food in real time is also beneficial to consumers’ judgement of food safety. This paper summarises the main raw materials for the preparation of bio-based smart active packaging, including proteins, polysaccharides and composite materials. The current status of the preparation method of bio-based smart active packaging and its application in food preservation is summarised. The future development trend in the field of food packaging is foreseen, so as to provide a reference for the improvement of bio-based smart active packaging materials.

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The N-N bond is widely found in natural products and bioactive compounds. The atropisomerism of N-N bond, however, has been dismissed for a long time due to the stereotype that N-N axis is unstable. The electronic barrier stemming from the repulsive interaction between the lone pairs on the two nitrogen atoms leads to a rotationally hindered axis, resulting in stable N-N atropisomers. Since the first report in 2021, the catalytic asymmetric synthesis of N-N atropisomers has been developed rapidly into an emerging area. These reactions include asymmetric N-H bond functionalization, asymmetric desymmetrization and atroposelective de novo construction of (hetero-)aromatic rings. The N-N axially chiral compounds are valuable molecules, in terms of their potential application in chiral ligand/catalysts design and biological activity evaluation. Herein, the state-of-the-art catalytic asymmetric synthesis of N-N atropisomers is summarized.

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