Novel polycyclic 1,3-dienes 4 and 5 have been synthesised and shown to undergo Diels–Alder cycloadditions exclusively from the carbonyl face. Steric environment seems to be predominantly responsible for the observed stereochemistry.
G. Mehta, S. Padma, S. H. K. Reddy and M. Nethaji, J. Chem. Soc., Perkin Trans. 1, 1994, 2049 DOI: 10.1039/P19940002049
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