An unusual linkage: The zirconocene-catalyzed hydrooligomerization of norbornene proceeds by σ-bond metathesis to form a 2-exo,7′-syn linkage (as evident in the pentamer shown). The oligomers were characterized by gas chromatography, NMR spectroscopy , X-ray crystallography, and DFT calculations.
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Karafilidis et al. (2004) studied this question.
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