Dias, Eric L. and Grubbs, Robert H. (1998) Synthesis and Investigation of Homo- and Heterobimetallic Ruthenium Olefin Metathesis Catalysts Exhibiting Increased Activities. Organometallics, 17 (13). pp. 2758-2767. ISSN 0276-7333. https://resolver.caltech.edu/CaltechAUTHORS:20180518-142549205
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Abstract
The previously reported ruthenium carbenes (PCy_3)_2Cl_2RuCHR (R = CHCPh_2 (1a), Ph (1b)) react with the bridged-chloride dimers [(p-cymene)RuCl_2]_2, [(p-cymene)OsCl_2]_2, and [(tBu_2Cp)RhCl_2]_2 to quantitatively form the bimetallic, bridged-chloride ruthenium carbenes 2a,b, 4a,b, and 6a,b and 1 equiv of each corresponding piano-stool complex. In the ring-opening metathesis polymerization of 1,5-cyclooctadiene, catalyst activity was found to increase in the order M = Ru < Os < Rh for the ancillary metal centers, with all of the bimetallic catalysts having higher activities than 1a,b. The kinetics of ROMP of the derivatized norbornene 9 were studied using catalyst 2a, and the data support an associative mechanism of olefin metathesis, contrary to the mechanism of olefin metathesis proposed for the parent catalysts 1a,b.
| Item Type: | Article | ||||||
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| Additional Information: | © 1998 American Chemical Society. Received October 10, 1997. Financial support has been provided by Rohm and Haas and the National Institute of Health. | ||||||
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| Issue or Number: | 13 | ||||||
| Record Number: | CaltechAUTHORS:20180518-142549205 | ||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20180518-142549205 | ||||||
| Official Citation: | Synthesis and Investigation of Homo- and Heterobimetallic Ruthenium Olefin Metathesis Catalysts Exhibiting Increased Activities Eric L. Dias and Robert H. Grubbs Organometallics 1998 17 (13), 2758-2767 DOI: 10.1021/om9708788 | ||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
| ID Code: | 86463 | ||||||
| Collection: | CaltechAUTHORS | ||||||
| Deposited By: | George Porter | ||||||
| Deposited On: | 21 May 2018 15:47 | ||||||
| Last Modified: | 03 Oct 2019 19:44 |
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