The stereochemistry of the title cycloaddition has been determined by lanthanide-induced shift experiments; the cyclobutanone ring is exo, while the t-butyl group is pointing towards the methylene bridge of norbornane.
M. D. Gheorghiu, P. Filip, C. Drăghici and L. Pârvulescu, J. Chem. Soc., Chem. Commun., 1975, 635 DOI: 10.1039/C39750000635
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