{HEAD ~ Ruthenium and osmium carbene compounds} that are stable in the presence of a variety of functional groups and can be used to catalyze {TAIL ~ olefin metathesis reactions} on unstrained cyclic and acyclic olefins are disclosed 
used to catalyze
{ HEAD ~ Ruthenium and osmium carbene compounds } that are stable in the presence of a variety of functional groups and can be used to catalyze { TAIL ~ olefin metathesis reactions } on unstrained cyclic and acyclic olefins are disclosed
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