Bioderived Acrylates from Alkyl Lactates via Pd-Catalyzed Hydroesterification

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Abstract

The conversion of methyl and ethyl lactate to their corresponding alkyl 2-(propionyloxy)propanoate esters was achieved by Pd catalyzed hydroesterificative coupling with carbon monoxide (CO) and ethylene (C2H4) at moderate temperatures and CO/C2H4 pressures. A screening of reaction conditions showed that the reaction could be carried out at low loadings of catalyst, which was generated in situ from inexpensive and commercially available reagents. High conversions and product yields were obtained in a variety of solvents and even under neat conditions. Product analysis identified transesterification to be the primary competing reaction, which could be mitigated by changing solvents, as well as minimizing the amount of excess acid present in solution. Pyrolysis of methyl and ethyl 2-(propionyloxy)propanoate transformed these esters into their respective acrylates suitable for subsequent polymerization, along with propionic acid as a valuable coproduct.

Original languageEnglish (US)
Pages (from-to)9579-9584
Number of pages6
JournalACS Sustainable Chemistry and Engineering
Volume6
Issue number8
DOIs
StatePublished - Aug 6 2018

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Keywords

  • Acrylates
  • Alkoxycarbonylation
  • Alkyl lactates
  • Carbonylation
  • Catalysis
  • Hydroesterification
  • Lactic acid
  • Pyrolysis

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