An ionic liquid (IL)-mediated facile method was established for the epoxidation of β-caryophyllene with molecular oxygen using ultrathin (∼3−6 nm) 2D Cu-, Co- or Ce-based MOF nanosheets. Under the optimum conditions, high selectivity (92.4%) and excellent yield (86.7%) for β-caryophyllene epoxide were obtained over ultrathin (∼5.5 nm) Cu-TCPP nanosheets (TCPP = tetrakis(4-carboxyphenyl)porphyrin) with the aid of [C₁₂mim]Cl at 313 K and 1 atm O₂. Notably, a small amount of [C₁₂mim]Cl (1-dodecyl-3-methylimidazolium chloride, 5.0 mol %) played pivotal roles in forming a favorable microenvironment in-situ, thus significantly improving the catalytic performances of above-mentioned Cu-TCPP nanosheets containing PVP stabilizer. Moreover, ultrathin Cu-TCPP nanosheets showed better stability during β-caryophyllene transformation in the presence of amphiphilic [C₁₂mim]Cl, as supported by TEM and XRD analyses. Importantly, the addition of TBHP (tert-butyl hydroperoxide, 13.0 mol %) initiator is also crucial for the aerobic oxidation of β-caryophyllene via Cu-TCPP nanosheets/[C₁₂mim]Cl/TBHP/O₂ nanosystem. Further insights into the synergistic effects and free radical mechanism were achieved by fluorescence, DRUV-Vis, UV-vis and XPS measurements.

建立了离子液体（IL）介导的简便方法，使用超薄（〜3-6 nm）2D Cu-，Co-或Ce-based MOF纳米片，用分子氧对β-石竹烯进行环氧化。在最佳条件下，借助超薄（〜5.5 nm）Cu-TCPP纳米片（TCPP =四（4-羧基苯基）卟啉），可以获得高选择性（92.4％）和优异的产率（86.7％）的β-石竹烯环氧化物。原子[C ₁₂ mim] Cl在313 K和1 atm O _2的摩尔数。值得注意的是，少量的[C ₁₂ mim] Cl（1-十二烷基-3-甲基咪唑鎓氯化物，5.0 mol％）在形成良好的原位微环境中起着关键作用，从而显着提高了上述催化性能。含PVP稳定剂的Cu-TCPP纳米片。此外，TEM和XRD分析表明，在两亲[C ₁₂ mim] Cl存在下，超薄Cu-TCPP纳米片在β-叶绿素转化过程中表现出更好的稳定性。重要的是，添加TBHP（氢过氧化叔丁基，13.0 mol％）引发剂对于经由Cu-TCPP纳米片/ [C ₁₂ mim] Cl / TBHP / O ₂纳米系统的有氧氧化β-石竹烯也是至关重要的。通过荧光，DRUV-Vis，UV-vis和XPS测量，可以进一步了解协同效应和自由基机理。