Latent ruthenium olefin metathesis catalysts featuring a phosphine or an N-heterocyclic carbene ligand.
2010 (English)In: Journal of Organometallic Chemistry, ISSN 0022-328X, E-ISSN 1872-8561, Vol. 695, no 14, 1831-1837 p.Article in journal (Refereed) Published
The synthesis and characterization of latent 18-electron ruthenium benzylidene complexes (PCy3)((ÎºN,O)-picolinate)2RuCHPh (5) and (H2IMes)((ÎºN,O)-picolinate)2RuCHPh (6) are described. Both complexes appear as two isomers. The ratio between the isomers is dependent on L-type ligand. The complexes are inactive in ring-closing metathesis and ring-opening metathesis polymn. reactions even at elevated temps. in the absence of stimuli. Upon addn. of HCl, complexes 5 and 6 become highly active in olefin metathesis reactions. The advantage of the latent catalysts is demonstrated in the ring-opening metathesis polymn. of dicyclopentadiene, where the latency of 6 assures adequate mixing of catalyst and monomer before initiation. Trapping expts. suggests that the acid converts the 18-electron complexes into their corresponding highly olefin metathesis active 14-electron benzylidenes. [on SciFinder(R)]
Place, publisher, year, edition, pages
2010. Vol. 695, no 14, 1831-1837 p.
phosphine heterocyclic carbene ligand ruthenium olefin metathesis catalyst
IdentifiersURN: urn:nbn:se:uu:diva-174511DOI: 10.1016/j.jorganchem.2010.04.017OAI: oai:DiVA.org:uu-174511DiVA: diva2:527608
CAPLUS AN 2010:791924(Journal)2012-05-212012-05-212012-05-21