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

Lingqiao Wu, Zahra Abada, Darren S. Lee, Martyn Poliakoff, Michael W. George

Research output: Journal PublicationArticlepeer-review

12 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3107-3112
Number of pages6
JournalTetrahedron
Volume74
Issue number25
DOIs
Publication statusPublished - 21 Jun 2018

Keywords

  • Continuous flow
  • Cyclopentadiene
  • Flow chemistry
  • Liquid CO
  • Photo-oxidation
  • Photochemistry
  • Singlet oxygen
  • Supercritical CO

ASJC Scopus subject areas

  • Biochemistry
  • Drug Discovery
  • Organic Chemistry

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