Catalytic hydrogenation of sorbic acid using pyrazolyl palladium(II) and nickel(II) complexes as precatalysts

Oluwasegun E. Olaoye, Olayinka Oyetunji, Banothile C.E. Makhubela, Apollinaire Muyaneza, Gopendra Kumar, James Darkwa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We have prepared several pyrazolyl palladium and nickel complexes ([(L1)PdCl2] (1), [(L2) PdCl2] (2), [(L3) PdCl2] (3), [(L1) NiBr2] (4), [(L2) NiBr2] (5) and [(L3) NiBr2] (6)) by reacting 3,5-dimethyl-1H-pyrazole (L1), 3,5-di-tert-butyl-1H-pyrazole (L2) and 5-ferrocenyl-1H-pyrazole(L3) with [PdCl2(NCMe)2] or [NiBr2(DME)] to afford mononuclear palladium and nickel complexes, respectively. These complexes were then investigated as pre-catalysts in the hydrogenation of 2,4-hexadienoic acid (sorbic acid). The active catalysts from these complexes demonstrate significant activities under mild experimental conditions. Additionally, the active catalysts show that the hydrogenation of sorbic acid proceeds in a sequential manner, where the less hindered C=C bond (4-hexenoic acid) is preferentially reduced over the more hindered C=C bond (2-hexenoic acid).

Original languageEnglish
Pages (from-to)50-56
Number of pages7
JournalSouth African Journal of Chemistry
Volume74
DOIs
Publication statusPublished - 2021

Keywords

  • Hydrogenation
  • Pyrazolyl catalysts
  • Selectivity
  • Sorbic acid

ASJC Scopus subject areas

  • General Chemistry

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