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Formal Co(0), Fe(0), and Mn(0) complexes with NHC and styrene ligation
Affiliation:1. Institute of Applied Chemistry, Shanxi University, Taiyuan 030006, China;2. State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China;1. Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstraße 2, Göttingen 37077, Germany;2. DZHK (German Centre for Cardiovascular Research), Göttingen, Germany;1. Department of Physics, Faculty of Science, Dokuz Eylül University, 35160, İzmir, Turkey;2. Department of Chemistry, Faculty of Arts and Sciences, Adnan Menderes University, 09010, Aydın, Turkey;1. Laboratory of Asymmetric Catalysis and Synthesis, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale dé Lausanne (EPFL), BCH 4305, CH-1015 Lausanne, Switzerland;2. https://lcsa.epfl.ch;1. Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstrasse 2, 37077 Göttingen, Germany;2. DZHK (German Center for Cardiovascular Research), Potsdamer Strasse 58, 10785 Berlin, Germany
Abstract:The limited knowledge on low-coordinate zero-valent transition-metal species has intrigued great synthetic efforts in developing ligand sets for their stabilization. While the combined ligand set of N-heterocyclic carbene (NHC) with vinylsilanes was the only known ligand system amenable to the stabilization of three-coordinate formal zero-valent cobalt, iron, and manganese complexes, the exploration on other ligands has proved that the ligand set of NHCs with styrene is equally effective in stabilizing three-coordinate formal zero-valent metal complexes in the form of (NHC)M(η2-CH2CHPh)2 (NHC = IPr, IMes; M = Co, Fe, Mn). These styrene complexes can be prepared by the one-pot reactions of MCl2 with styrene, NHC and KC8, and have been characterized by various spectroscopic methods. Preliminary reactivity study indicated that the interaction of [(IMes)Fe(η2-CH2CHPh)2] with DippN3 produces the iron(IV) bisimido complex [(IMes)Fe(NDipp)2] and styrene, which hints at the utility of these zero-valent metal styene complexes as synthons of the mono-coordinate species (NHC)M(0).
Keywords:Alkene  Cobalt  Iron  Manganese
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