doi:10.1021/ja904893jengCastro-Rodrigo, R.Esteruelas, M.A.Fuertes, S.Lopez, A.M.Lopez, F.Mascarenas, J.L.Mozo, S.Onate, E.Saya, L.Villarino, L.Formation of Osmium- and Ruthenium-Cyclobutylidene Complexes by Ring Expansion of AlkylidenecyclopropanesART-2009-61808Alkylidenecyclopropanes containing a chelation assistant at the terminal carbon atom of the olefinic moiety undergo an Os- or Ru-promoted ring expansion reaction to afford metal cyclobutylidene derivatives. The process occurs through a novel mechanism that implies a 1,2-migration of a CH2 group of the three-membered ring from an olefinic carbon atom to the other one. It takes place, without direct participation of the metal, on a metallaheterocyclopentene intermediate which is generated from an η2-methylenecyclopropane species stabilized by coordination of the chelation assistant.2009http://zaguan.unizar.es/record/13113510.1021/ja904893jhttp://zaguan.unizar.es/record/131135oai:zaguan.unizar.es:131135info:eu-repo/grantAgreement/ES/DGA/E35info:eu-repo/grantAgreement/ES/MICINN/CSD2007-00006info:eu-repo/grantAgreement/ES/MICINN/CTQ2008-00810info:eu-repo/grantAgreement/ES/MICINN/SAF2007-61015Journal of the American Chemical Society 131, 43 (2009), 15572-15573All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess