The stereochemistry of dihydropyran aldehydes obtained from the acid-catalysed dimerisation of crotonaldehyde is discussed. Spectroscopic evidence for its re-assignment is presented, based on examination of the corresponding acids.
D. W. Cameron and P. E. Schütz, J. Chem. Soc. C, 1968, 1801 DOI: 10.1039/J39680001801
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