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Mechanism of the Ru-Allenylidene to Ru-Indenylidene Rearrangement in Ruthenium Precatalysts for Olefin Metathesis

The intramolecular allenylidene RuCl2(PR3)2(C=C=CPh2) to indenylidene RuCl2(PR3)2(Ind) rearrangement that occurs during the synthesis of Ru-based precatalysts for olefin metathesis is presented. In the absence of acid, the ring closure via C-H activation was shown to be unfavored for energy barriers up to 70 kcal/mol. Thus, it turned out to be HCl (or other acid) that plays a crucial role during formation of the indenylidene, as the upper energy barrier decreases to a reasonable 35 kcal/mol. Moreover, we proved computationally that depending on the nature of the phosphine the intramolecular rearrangement is either facilitated (PPh3) or slightly hampered (PCy3), which is in line with experimental results

A.P. thanks the Spanish MINECO for Project CTQ2014-59832-JIN and the European Commission for a Career Integration Grant (CIG09-GA-2011-293900)

American Chemical Society (ACS)

Director: Ministerio de Economía y Competitividad (Espanya)
Autor: Pump, Eva
Slugovc, Christian
Cavallo, Luigi
Poater Teixidor, Albert
Data: 13 juliol 2015
Resum: The intramolecular allenylidene RuCl2(PR3)2(C=C=CPh2) to indenylidene RuCl2(PR3)2(Ind) rearrangement that occurs during the synthesis of Ru-based precatalysts for olefin metathesis is presented. In the absence of acid, the ring closure via C-H activation was shown to be unfavored for energy barriers up to 70 kcal/mol. Thus, it turned out to be HCl (or other acid) that plays a crucial role during formation of the indenylidene, as the upper energy barrier decreases to a reasonable 35 kcal/mol. Moreover, we proved computationally that depending on the nature of the phosphine the intramolecular rearrangement is either facilitated (PPh3) or slightly hampered (PCy3), which is in line with experimental results
A.P. thanks the Spanish MINECO for Project CTQ2014-59832-JIN and the European Commission for a Career Integration Grant (CIG09-GA-2011-293900)
Format: application/pdf
Accés al document: http://hdl.handle.net/10256/13298
Llenguatge: eng
Editor: American Chemical Society (ACS)
Col·lecció: info:eu-repo/semantics/altIdentifier/doi/10.1021/om501246q
info:eu-repo/semantics/altIdentifier/issn/0276-7333
info:eu-repo/semantics/altIdentifier/eissn/1520-6041
info:eu-repo/grantAgreement/MINECO//CTQ2014-59832-JIN/ES/ESCANEO COMPUTACIONAL DE RELACIONES ESTRUCTURA%2FACTIVIDAD DE CATALIZADORES DE OXIDACION DEL AGUA PARA LA GENERACION DE H2/
info:eu-repo/grantAgreement/EC/FP7/293900/EU/Ab initio Statics and Molecular Dynamics Simulation of Olefin Metathesis Catalysts for pharmacological purposes/COMPUTEDRUG
Drets: Tots els drets reservats
Matèria: Metàtesi (Química)
Metathesis (Chemistry)
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Alkenes
Títol: Mechanism of the Ru-Allenylidene to Ru-Indenylidene Rearrangement in Ruthenium Precatalysts for Olefin Metathesis
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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