Carbocyclic pincer carbene complexes of ruthenium: syntheses and reversible hydrogenation

The ruthenium carbene pincer complex 2 was synthesized treating the benzo annulated cycloheptatriene bisphosphine 1 with RuCl 3 . Addition of three equivalents of hydrogen to the carbocyclic carbene complex 2 was achieved in reaction of 2 with hydrogen at elevated temperatures. Hydrogenated complex...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2021-09, Vol.5 (34), p.11814-1182
Main Authors: Wiedmaier, Nicholas R, Schubert, Hartmut, Mayer, Hermann A, Wesemann, Lars
Format: Article
Language:English
Subjects:
Crystallography
Dehydrogenation
Equivalence
Ethane
High temperature
NMR
Nuclear magnetic resonance
Ruthenium trichloride
Toluene
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Summary:The ruthenium carbene pincer complex 2 was synthesized treating the benzo annulated cycloheptatriene bisphosphine 1 with RuCl 3 . Addition of three equivalents of hydrogen to the carbocyclic carbene complex 2 was achieved in reaction of 2 with hydrogen at elevated temperatures. Hydrogenated complex 4 , exhibiting a rigid chair conformation in solution, was dehydrogenated by heating a toluene solution of complex 4 to reflux for 5-7 d. In reaction with ethylene, complex 4 transfers one equivalent of hydrogen, forming ethane and alkyl complex 5 . Double C-H activation leads to the formation of a ruthenium carbocyclic carbene PCP pincer complex. Uptake and release of three equivalents of hydrogen involving the cycloheptatriene moiety acting as a cooperative ligand was realized.
ISSN:1477-9226
1477-9234
DOI:10.1039/d1dt02266k