Visible-Light-Induced Organic Transformations

Early in a century ago, chemists have payed much attention on converting solar energy into chemical energy for chemical transformations by using sunlight as a safe, abundant, inexpensive, and renewable source. And in recent years, visible light induced organic transformations have emerged as one of the most active research topics in organic synthesis. In this text, recent developments in this area were reviewed and we also presented the related visible light induced organic transformations as follows:1. A visible-light-induced direct thiolation at α-C(sp3)-H of ethers with disulfides was developed. To the best of our knowledge, it is the first example of coupling reaction through energy transfer pathway using acridine red 3B as photocatalyst,TBHP as oxidant, 4 ? molecular sieve as additive and irradiated under 3 W green LED. Based on the experimental probes, fluorescence quenching experiments and kinetic isotope effect studies, we proposed a plausible mechanism.2. A thiyl radical catalyzed oxidation of diarylalkynes to α-diketones by molecular oxygen under visible-light irradiation was described. 4,4’-dinitrodiphenyldisulfide was used as a pre-thiyl radical catalyst, air was used as oxidant under irradiated with 3 W green LED for this transformation. The reaction proceeded smoothly under mild conditions and generated the desired products in excellent yields with good tolerance of functional groups. Based on the control experiments and electron paramagnetic resonance spectrometer studies, a plausible mechanism was proposed.3. A recyclable magnetic nanoparticals suppored eosin Y catalyst was prepared and applied in the C–C and C–P bond formation under visible light irradiation. The magnetic nanoparticals suppored catalyst could be recovered easily and reused for 10 times without significant loss of its reactivity.