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Ring‐opening metathesis (ROM), when applied to the synthesis of bicyclic alkenes, is the basis of ring‐opening‐metathesis polymerisation (ROMP). This polymerisation reaction can be suppressed in the presence of a second open‐chain olefin thus combining the ROM with an intermolecular cross metathesis (CM). In conveniently substituted bicyclic derivatives a third metathetical reaction — ring closing metathesis (RCM) — can be achieved, giving new substituted bicyclic systems. In this account the results of these tandem metathetical reactions performed on oxa‐ and azabicyclic norbornenic derivatives are highlighted. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)

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