Abstract
AbstractThe configuration of the two isomers obtained by the Diels‐Alder reaction of the 2‐azadiene I with N‐phenylmaleimide II (scheme) is established by X‐ray diffraction; The cycloaddition takes place with a high endo selectivity. The geometry of the two isomers is similar and the piperidone ring has a twist conformation in both molecules.
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