Domino Ring-Opening Metathesis–Ring-Closing Metathesis of Bicyclo[2.2.2]octene Derivatives: Scope and Limitations

Domino metathesis involving ring-opening metathesis–ring-closing
metathesis (ROM–RCM) of a bicyclo[2.2.2]­octene derivative having
an appropriate alkene chain, expected to produce a 7/6 fused bicyclic
system, provided a decalin system in contrast to ROM–RCM of
the corresponding bicyclo[2.2.1]­heptene analogues, which as expected
produced the 7/5 fused bicycles. The expected 6/7 bicyclic system
could, however, be made through RCM of the elusive ROM product prepared
from the same bicyclo[2.2.2]­octene analogue by a nonmetathetic route.
A rationale to explain the difference in reactivity pattern between
these two systems toward ROM–RCM has been forwarded.