This review summarizes the latest trends and developments of isoxazole-enabled alkyne amination reactions and their applications in divergent heterocycle synthesis.

Europium(III) β-diketone and organic carboxylic acid complexes are designable, easy to prepare, and easy to modify and have excellent fluorescence properties (narrow emission spectral band, high colour purity, long fluorescence lifetime, high quantum yield, and a spectral emission range covering both the visible and near-infrared regions). These complexes play important roles in popular fields such as laser and fibre-optic communications, medical diagnostics, immunoassays, fluorescent lasers, sensors, anticounterfeiting, and organic light-emitting diodes (OLEDs). In the field of light-emitting materials, europium complexes are especially widely used in OLED lamps, especially because of their high-efficiency emission of red (among the three primary colours); accordingly, these complexes can be mixed with blue and green phosphors to obtain high-efficiency white phosphors that can be excited by near-ultraviolet light. This paper reviews the red-light-emitting europium complexes with β-diketone and organic carboxylic acid as ligands that have been studied over the last five years, describes the current problems, and discusses their future application prospects.

Three novel iridium(III) complexes with pyrimidine carboxylic acid as the auxiliary ligand were designed, showing adjustable emission peak wavelengths from 559 nm to 610 nm with relatively high photoluminescence quantum yields (PLQYs) of 58–89% in CH₂Cl₂. The structures of the title complexes were confirmed by single-crystal X-ray diffraction (XRD), nuclear magnetic resonance spectroscopy (NMR), and high-resolution mass spectrometry (HRMS). Their electronic states were investigated using time-dependent density functional theory (TD-DFT) calculations. When employing these emitters to fabricate solution-processed organic light-emitting diodes (OLEDs), the obtained orange and red OLEDs exhibit prominent performances with the maximum current efficiencies of 95.4 cd A⁻¹ and 39.8 cd A⁻¹, and the maximum external quantum efficiencies (EQE_max) of 31.3% and 24.7%, both of which are ranked among the highest values for orange and red solution-processed OLEDs.

Photoinduced acylmethyl radical procedures for the efficient and simple preparation of highly functionalized 1,5-dicarbonyl compounds from Morita–Baylis–Hillman acetates with α-bromo ketones are developed. The acylmethylation is carried out with rose bengal as an organophotocatalyst at room temperature under metal- and oxidant-free conditions. In particular, the simple photoinduced bromoacylmethylation is performed via a fac-Ir(ppy)₃-catalyzed atom-transfer radical addition (ATRA) strategy under visible light irradiation. These methods are attractive and valuable due to their mild reaction conditions, a broad substrate scope and good functional group tolerance.