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Norbornadiene is a bicyclic hydrocarbon and an organic compound. Norbornadiene is of interest as a metal-binding ligand, whose complexes are useful for homogeneous catalysis. It has been intensively studied owing to its high reactivity and distinctive structural property of being a diene that cannot isomerize (isomers would be anti-Bredt olefins).
Benzvalene is an organic compound and one of several isomers of benzene. It was first synthesized in 1971 by Thomas J. Katz et al.