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New latent metathesis catalysts equipped with exchangeable boronic ester groups on the NHC

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Latent metathesis catalysts equipped with boronate esters of diols as exchangeable end-groups on their NHC ligands and an S-chelated ruthenium-benzylidene core were synthesized. The stable S-chelated ruthenium complexes underwent hydrolysis under mild acidic conditions, allowing easy exchange of terminal units by several 1,2- and 1,3-diols, without degrading the central ruthenium benzylidene. Using this strategy, we also prepared metathesis catalysts equipped with diallyl substrates at the termini that showed concentration dependency on RCM reactions. Notably, the larger dendritic catalysts were more efficient at the more dilute condition.
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Keywords: Olefin metathesis; boronic esters; carbenes; dynamic covalent reactions; latent catalysts

Document Type: Research Article

Affiliations: 1: Department of Natural Sciences, The Open University of Israel, Ra’anana, Israel 2: Faculty of Natural Sciences, Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, Israel

Publication date: July 3, 2018

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