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Beilstein J. Org. Chem. 2011, 7, 578–581, doi:10.3762/bjoc.7.67
Graphical Abstract
Scheme 1: A new entry to substituted cross-conjugated trienes.
Scheme 2: A proposed reaction pathway.
Scheme 3: [4 + 2] cycloaddition reaction of 3a with PTAD and TCNE.