In 2019,Journal of the American Chemical Society included an article by Daub, Mary Elisabeth; Jung, Hoimin; Lee, Byung Joo; Won, Joonghee; Baik, Mu-Hyun; Yoon, Tehshik P.. Safety of Methyltriphenylphosphonium bromide. The article was titled 《Enantioselective [2+2] Cycloadditions of Cinnamate Esters: Generalizing Lewis Acid Catalysis of Triplet Energy Transfer》. The information in the text is summarized as follows:
We report the enantioselective [2+2] cycloaddition of simple cinnamate esters, the products of which are useful synthons for the controlled assembly of cyclobutane natural products. This method utilizes a cocatalytic system in which a chiral Lewis acid accelerates the transfer of triplet energy from an excited-state Ir(III) photocatalyst to the cinnamate ester. Computational evidence indicates that the principal role of the Lewis acid cocatalyst is to lower the absolute energies of the substrate frontier MOs, leading to greater electronic coupling between the sensitizer and substrate and increasing the rate of the energy transfer event. These results suggest Lewis acids can have multiple beneficial effects on triplet sensitization reactions, impacting both the thermodn. driving force and kinetics of Dexter energy transfer. In the part of experimental materials, we found many familiar compounds, such as Methyltriphenylphosphonium bromide(cas: 1779-49-3Safety of Methyltriphenylphosphonium bromide)
Methyltriphenylphosphonium bromide(cas: 1779-49-3) is an organophosphorus compound, with potential use as a precursor and a solvent in organic synthesis. And it is used widely for methylenation via the Wittig reaction.Safety of Methyltriphenylphosphonium bromide
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary