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Synthesis 1991; 1991(4): 320-322
DOI: 10.1055/s-1991-26456
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The Use of Pyrylium Tetrafluoroborate for the Stereoselective Synthesis of 2Z,4E-Dienals

Yuri Y. Belosludtsev* , Bennett C. Borer, Richard J. K. Taylor
  • *School of Chemical Sciences, University of East Anglia, Norwich, Norfolk NR4 7TJ, England
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Publication Date:
29 April 2002 (online)

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The addition of organolithium reagents to pyrylium tetrafluoroborate followed by in situ electrocyclic ring opening of the intermediate 2H-pyrans gives the title Z,E-dienals with high stereoselectivity.