Azetidines are an important class of saturated four-membered nitrogen-containing heterocyclic compounds. The research hotspots related to this structure mainly focus on two aspects: one is the research of pharmaceutical chemistry; the other is related to chiral azetidines, using rigid azetidine compounds as chiral ligands for asymmetric catalytic reactions. Many nitrogen-containing heterocycles play important roles in drug structures, and in many cases small structural changes can improve ligand selectivity and pharmacokinetic properties.
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Tetrahydrothiophene is a sulfur-containing saturated heterocyclic compound obtained by catalytic hydrogenation of thiophene. After thiophene is reduced to tetrahydrothiophene, it no longer has a conjugated system and aromaticity. Therefore, tetrahydrothiophene shows the properties of general thioethers. Easily oxidized to sulfoxides and sulfones. Tetrahydrothiophene can be used as a raw material for the production of pharmaceuticals, pesticides and photochemicals.
Fluorene is a polycyclic aromatic hydrocarbon insoluble in water and soluble in many organic solvents. Fluorenes are one of the most important fluorescent molecules with applications in polymers, electronic devices, sensors, and photochromic materials.