Selective dehydrogenation of dipentene (R-(+)-limonene) into paracymene on silica supported palladium assisted by α-olefins as hydrogen acceptor

P. Lesage, J. P. Candy, C. Hirigoyen, F. Humblot, Jean-Marie Maurice Basset*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Paracymene is a well known material used in polymers and perfume chemistry. It can be obtained by the dehydrogenation and the aromatization of dipentene (R-(+)-limonene). To be useful, this reaction must be fully selective to avoid further purification processes. Dipentene is readily dehydrogenated with a palladium catalyst, but hydrogenation simultaneously takes place leding to cis and trans paramenthanes which drastically decreases the yield in paracymene. To avoid this hydrogenation which occurs by hydrogen transfer, α-olefin has been used as hydrogen acceptor. Using silica supported palladium and a hydrogen acceptor (e.g. l-decene) paracymene is obtained from dipentene with a very high yield (95%) at a moderate temperature (145°C).

Original languageEnglish (US)
Pages (from-to)431-435
Number of pages5
JournalJournal of Molecular Catalysis A: Chemical
Volume112
Issue number3
DOIs
StatePublished - Nov 10 1996

Keywords

  • Dehydrogenation
  • Hydrogen transfer reaction
  • Paracymene
  • Pd/SiO
  • R-(+)-limonene

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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