Combining engineering and chemistry for the selective continuous production of four different oxygenated compounds by photo-oxidation of cyclopentadiene using liquid and supercritical CO2 as solvents |
| |
Authors: | Lingqiao Wu Zahra Abada Darren S Lee Martyn Poliakoff Michael W George |
| |
Institution: | 1. School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK;2. Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, 199 Taikang East Road, Ningbo, 315100, China |
| |
Abstract: | A range of products is reported from the photo-oxidation of cyclopentadiene from photochemically generated singlet oxygen (1O2) using carbon dioxide (CO2) as a solvent and 5,10,15,20-tetrakis-(pentafluorophenyl)porphyrin (TPFPP) as a CO2-soluble photosensitizer. The endo-peroxide intermediate, generated from the reaction with singlet oxygen, is transformed into one of several different products in good yield depending on the conditions applied and by adding different reactors and reagents downstream of the photo-reactor, allowing the reaction products to be switched in one streamlined process. The addition of a thermal reactor facilitated the rearrangement of the endoperoxide to form Z-4,5-epoxy-2-pentanal. Quenching with thiourea yielded the syn-diol, (1R,3S)-cyclopent-4-ene-1,3-diol. Treatment with acid or base afforded furfuryl alcohol and 4-hydroxy-2-cyclopentenone respectively. High productivities for all products were obtained when compared to traditional batch reactions. |
| |
Keywords: | Photo-oxidation Photochemistry Cyclopentadiene Singlet oxygen Continuous flow Flow chemistry |
本文献已被 ScienceDirect 等数据库收录! |
|