Propellanes. Part LXXI. Confirmation of predicted regiospecificity in Diels‐Alder reactions of certain propellanes with 4‐phenyl‐1,2,4‐triazoline‐3,5‐dione

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Abstract
Two isomeric propellane epoxides 1a and 1b containing a cyclohexadiene ring are attacked by the title dienophile as predicted, syn to the five‐membered ether ring whose α‐hydrogens exert less repulsion than the α‐epoxy hydrogens or the epoxide oxygen, respectively, of the cyclobutane ring.