Abstract
Treatment of electron rich carbene precursor olefins, L2 R (R= CH2CH2OMe, CH2Mes), bearing a 2,4,6-trimethylbenzyl group on the N atom(s), with [RuCl2(η6-arene)]2 (arene =p-cymene, hexamethylbenzene) can afford one of two products. Thus, cleavage of the bridge occurs to yield the expected carbene ruthenium(II) complex 5 or further a displacement reaction can occur to give chelated η6-mesitylene carbene complexes 6 and 7 (Scheme 1). In a separate but complementary research area we also have interests in the rapidly developing chemistry of (η6-arene)(N-alkylbenzimidazole)mthenium (II), 8.
Compounds 6 and 7 were transformed into the corresponding cationic allenylidene complexes (6 → 6′ 7→ 7′ 8→8′) by AgOTf and propargylic alcohol HC=CCPh2OH. In the same cases the in situ generated intermediates were found to be active and selective catalysts for ring closing metathesis (RCM) or cycloisomerization reactions of 1,6-dienes.
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Çetinkaya, B., Özdemir, I., Çetinkaya, E., Bruneau, C., Dixneuf, P. (2003). Ring Closing Versus Cyclic Isomerization of 1,6-Dienes by Ruthenium Allenylidene Complexes. In: Imamoglu, Y., Bencze, L. (eds) Novel Metathesis Chemistry: Well-Defined Initiator Systems for Specialty Chemical Synthesis, Tailored Polymers and Advanced Material Applications. NATO Science Series, vol 122. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0066-6_25
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DOI: https://doi.org/10.1007/978-94-010-0066-6_25
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