Gas-phase Meerwein-Ponndorf-Verley reaction: Correlation of the 3665 cm-1 IR band with the cis-alcohol selectivity

Burcu Akata, Juliusz Warzywoda, Albert Sacco

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15 Scopus citations

Abstract

The two Lewis acid sites assumed to catalyze the Meerwein-Ponndorf-Verley (MPV) reaction are identified by IR bands at 3782 and 3660-3680 cm -1. Different combinations of heat-treatment protocols were used and the results indicated that the final temperature, ramp rate, and gas environment make a difference in the relative intensities of the 3782 and 3665 cm-1 bands. Combining different heat-treatment procedures, samples were produced where the 3782 and 3665 cm-1 band intensities moved in opposite directions (i.e., one increasing and the other decreasing). The MPV reduction of 4-tert-butylcyclohexanone with 2-propanol in the gas phase was studied at 100°C in a nitrogen atmosphere. The increasing trend of the relative intensity of the 3665 cm-1 band showed a correlation in favor of the formation of cis-4-tert-butylcyclohexanol (cis-4-TBCHL). This suggests that the species associated with the 3665 cm-1 band are likely responsible for cis-4-TBCHL selectivity.

Original languageEnglish
Pages (from-to)397-403
Number of pages7
JournalJournal of Catalysis
Volume222
Issue number2
DOIs
StatePublished - Mar 10 2004

Keywords

  • IR spectroscopy
  • Lewis acidity
  • Meerwein-Ponndorf-Verley reaction
  • Zeolite Beta

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