Catalyst Screening by Electrospray Ionization Tandem Mass Spectrometry: Hofmann Carbenes for Olefin Metathesis
A new screening methodology, which combines in situ synthesis of complexes with an assay by electrospray ionization tandem mass spectrometry (ESI‐MS), is introduced in order to investigate highly active, cationic ruthenium–carbene catalysts in ring‐opening metathesis polymerization (ROMP). The param...
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| Veröffentlicht in: | Chemistry : a European journal Jg. 7; H. 21; S. 4621 - 4632 |
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Weinheim
WILEY-VCH Verlag GmbH
05.11.2001
WILEY‐VCH Verlag GmbH |
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| Abstract | A new screening methodology, which combines in situ synthesis of complexes with an assay by electrospray ionization tandem mass spectrometry (ESI‐MS), is introduced in order to investigate highly active, cationic ruthenium–carbene catalysts in ring‐opening metathesis polymerization (ROMP). The parameter space, whic is defined by systematic variation of four structural features of the catalyst [{R2P(CH2)nPR2‐κ2P}XRu=CHR′]+ (the halogen ligand, the diphosphane bite‐angle, the steric bulk of the phosphane, and the carbene ligand) and the variation of the metathesis substrate, is mapped out. Chloride as the anionic ligand X, a small chelating angle (n=1), and reduced steric demand of the substituents R (Cy versus tBu) lead to the most reactive complex in acyclic olefin metathesis, whereas variation of the carbene moiety CHR′ has only a modest influence. The overall rate in the gas phase depends on the π‐complex preequilibrium and metallacyclobutane formation, which was found to be the rate‐determining step. In ROMP reactions backbiting has a profound influence on the overall rate. Moreover, we were able to establish that the reactivity trends determined in the gas phase parallel solution‐phase reactivity. The overall rate in solution is also determined by a favorable dimer/monomer preequilibrium providing the active catalyst by facile dissociation of dicationic, dinuclear catalyst precursors.
A new and efficient high‐throughput screening methodology, which combines in situ synthesis of catalysts with an assay by electrospray ionization tandem mass spectrometry (ESI‐MS), is introduced in order to investigate the highly active olefin metathesis ruthenium–carbene catalysts [{R2P(CH2)nPR2‐κ2P}XRu=CHR′]+. A five‐dimensional parameter space was scanned in a total of 1800 experiments (see diagram). The study reveals how structural modifications and the nature of the substrate govern catalyst reactivity towards olefins and uncovers key mechanistic details. |
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| AbstractList | A new screening methodology, which combines in situ synthesis of complexes with an assay by electrospray ionization tandem mass spectrometry (ESI-MS), is introduced in order to investigate highly active, cationic ruthenium-carbene catalysts in ring-opening metathesis polymerization (ROMP). The parameter space, whic is defined by systematic variation of four structural features of the catalyst [[R2P(CH2),PR2-kappa2-P]XRu=CHR']+ (the halogen ligand, the diphosphane bite-angle, the steric bulk of the phosphane, and the carbene ligand) and the variation of the metathesis substrate, is mapped out. Chloride as the anionic ligand X, a small chelating angle (n = 1), and reduced steric demand of the substituents R (Cy versus tBu) lead to the most reactive complex in acyclic olefin metathesis, whereas variation of the carbene moiety CHR' has only a modest influence. The overall rate in the gas phase depends on the pi-complex preequilibrium and metallacyclobutane formation, which was found to be the rate-determining step. In ROMP reactions backbiting has a profound influence on the overall rate. Moreover, we were able to establish that the reactivity trends determined in the gas phase parallel solution-phase reactivity. The overall rate in solution is also determined by a favorable dimer/ monomer preequilibrium providing the active catalyst by facile dissociation of dicationic, dinuclear catalyst precursors. A new screening methodology, which combines in situ synthesis of complexes with an assay by electrospray ionization tandem mass spectrometry (ESI-MS), is introduced in order to investigate highly active, cationic ruthenium-carbene catalysts in ring-opening metathesis polymerization (ROMP). The parameter space, whic is defined by systematic variation of four structural features of the catalyst [[R2P(CH2),PR2-kappa2-P]XRu=CHR']+ (the halogen ligand, the diphosphane bite-angle, the steric bulk of the phosphane, and the carbene ligand) and the variation of the metathesis substrate, is mapped out. Chloride as the anionic ligand X, a small chelating angle (n = 1), and reduced steric demand of the substituents R (Cy versus tBu) lead to the most reactive complex in acyclic olefin metathesis, whereas variation of the carbene moiety CHR' has only a modest influence. The overall rate in the gas phase depends on the pi-complex preequilibrium and metallacyclobutane formation, which was found to be the rate-determining step. In ROMP reactions backbiting has a profound influence on the overall rate. Moreover, we were able to establish that the reactivity trends determined in the gas phase parallel solution-phase reactivity. The overall rate in solution is also determined by a favorable dimer/ monomer preequilibrium providing the active catalyst by facile dissociation of dicationic, dinuclear catalyst precursors.A new screening methodology, which combines in situ synthesis of complexes with an assay by electrospray ionization tandem mass spectrometry (ESI-MS), is introduced in order to investigate highly active, cationic ruthenium-carbene catalysts in ring-opening metathesis polymerization (ROMP). The parameter space, whic is defined by systematic variation of four structural features of the catalyst [[R2P(CH2),PR2-kappa2-P]XRu=CHR']+ (the halogen ligand, the diphosphane bite-angle, the steric bulk of the phosphane, and the carbene ligand) and the variation of the metathesis substrate, is mapped out. Chloride as the anionic ligand X, a small chelating angle (n = 1), and reduced steric demand of the substituents R (Cy versus tBu) lead to the most reactive complex in acyclic olefin metathesis, whereas variation of the carbene moiety CHR' has only a modest influence. The overall rate in the gas phase depends on the pi-complex preequilibrium and metallacyclobutane formation, which was found to be the rate-determining step. In ROMP reactions backbiting has a profound influence on the overall rate. Moreover, we were able to establish that the reactivity trends determined in the gas phase parallel solution-phase reactivity. The overall rate in solution is also determined by a favorable dimer/ monomer preequilibrium providing the active catalyst by facile dissociation of dicationic, dinuclear catalyst precursors. A new screening methodology, which combines in situ synthesis of complexes with an assay by electrospray ionization tandem mass spectrometry (ESI‐MS), is introduced in order to investigate highly active, cationic ruthenium–carbene catalysts in ring‐opening metathesis polymerization (ROMP). The parameter space, whic is defined by systematic variation of four structural features of the catalyst [{R2P(CH2)nPR2‐κ2P}XRu=CHR′]+ (the halogen ligand, the diphosphane bite‐angle, the steric bulk of the phosphane, and the carbene ligand) and the variation of the metathesis substrate, is mapped out. Chloride as the anionic ligand X, a small chelating angle (n=1), and reduced steric demand of the substituents R (Cy versus tBu) lead to the most reactive complex in acyclic olefin metathesis, whereas variation of the carbene moiety CHR′ has only a modest influence. The overall rate in the gas phase depends on the π‐complex preequilibrium and metallacyclobutane formation, which was found to be the rate‐determining step. In ROMP reactions backbiting has a profound influence on the overall rate. Moreover, we were able to establish that the reactivity trends determined in the gas phase parallel solution‐phase reactivity. The overall rate in solution is also determined by a favorable dimer/monomer preequilibrium providing the active catalyst by facile dissociation of dicationic, dinuclear catalyst precursors. A new and efficient high‐throughput screening methodology, which combines in situ synthesis of catalysts with an assay by electrospray ionization tandem mass spectrometry (ESI‐MS), is introduced in order to investigate the highly active olefin metathesis ruthenium–carbene catalysts [{R2P(CH2)nPR2‐κ2P}XRu=CHR′]+. A five‐dimensional parameter space was scanned in a total of 1800 experiments (see diagram). The study reveals how structural modifications and the nature of the substrate govern catalyst reactivity towards olefins and uncovers key mechanistic details. |
| Author | Adlhart, Christian Kiener, Christoph Alexander Chen, Peter Hofmann, Peter Volland, Martin August Otfried |
| Author_xml | – sequence: 1 givenname: Martin August Otfried surname: Volland fullname: Volland, Martin August Otfried organization: Universität Heidelberg, Organisch−Chemisches Institut Im Neuenheimer Feld 270, 69120 Heidelberg (Germany) Fax: (+49) 6221-54-4885 – sequence: 2 givenname: Christian surname: Adlhart fullname: Adlhart, Christian organization: Eidgenössische Technische Hochschule Laboratorium für Organische Chemie ETH Hönggerberg, 8093 Zürich (Switzerland) Fax: (+41) 1-63-21280 – sequence: 3 givenname: Christoph Alexander surname: Kiener fullname: Kiener, Christoph Alexander organization: Universität Heidelberg, Organisch−Chemisches Institut Im Neuenheimer Feld 270, 69120 Heidelberg (Germany) Fax: (+49) 6221-54-4885 – sequence: 4 givenname: Peter surname: Chen fullname: Chen, Peter email: chen@org.chem.ethz.ch organization: Eidgenössische Technische Hochschule Laboratorium für Organische Chemie ETH Hönggerberg, 8093 Zürich (Switzerland) Fax: (+41) 1-63-21280 – sequence: 5 givenname: Peter surname: Hofmann fullname: Hofmann, Peter email: ph@phindigo.oci.uni-heidelberg.de organization: Universität Heidelberg, Organisch−Chemisches Institut Im Neuenheimer Feld 270, 69120 Heidelberg (Germany) Fax: (+49) 6221-54-4885 |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/11757654$$D View this record in MEDLINE/PubMed |
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| SubjectTerms | carbene ligands high-throughput screening mass spectrometry metathesis ruthenium |
| Title | Catalyst Screening by Electrospray Ionization Tandem Mass Spectrometry: Hofmann Carbenes for Olefin Metathesis |
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