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X\u2010ray crystallographic analysis of three untethered and two tethered Ru N\u2010heterocyclic carbene (NHC) complexes were also carried out. These RuNHC complexes catalyze transfer hydrogenation of aromatic ketones in 2\u2010propanol under reflux, optimally in the presence of (25\u2005mol\u2009%) KOH. Under these conditions, the formation of 2\u20133\u2005nm\u2010sized Ru<jats:sup>0<\/jats:sup> nanoparticles was detected by TEM measurements. A solid\u2010state NMR investigation of the nanoparticles suggested that the NHC ligands were bound to the surface of the Ru nanoparticles (NPs). This base\u2010promoted route to NHC\u2010stabilized ruthenium nanoparticles directly from arene\u2010tethered ruthenium\u2013NHC complexes and from untethered ruthenium\u2013NHC complexes is more convenient than previously known routes to NHC\u2010stabilized Ru nanocatalysts. Similar catalytically active RuNPs were also generated from the reaction of a mixture of [RuCl<jats:sub>2<\/jats:sub>(<jats:italic>p<\/jats:italic>\u2010cymene)]<jats:sub>2<\/jats:sub> and the NHC precursor with KOH in isopropanol under reflux. The transfer hydrogenation catalyzed by these NHC\u2010stabilized RuNPs possess a high turnover number. The catalytic efficiency was significantly reduced if nanoparticles were exposed to air or allowed to aggregate and precipitate by cooling the reaction mixtures during the reaction.<\/jats:p>","DOI":"10.1002\/chem.202000142","type":"journal-article","created":{"date-parts":[[2020,2,12]],"date-time":"2020-02-12T01:06:10Z","timestamp":1581469570000},"page":"7622-7630","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":34,"title":["N\u2010Heterocyclic Carbene (NHC)\u2010Stabilized Ru<sup>0<\/sup> Nanoparticles: In Situ Generation of an Efficient Transfer Hydrogenation Catalyst"],"prefix":"10.1002","volume":"26","author":[{"given":"Lakshay","family":"Kathuria","sequence":"first","affiliation":[{"name":"Inorganic and Physical Chemistry Department Indian Institute of Science  Bangalore Karnataka 560012 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noor U.","family":"Din 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