Tonde, Sunil S. ; Kelkar, Ashutosh A. ; Bhadbhade, Mohan M. ; Chaudhari, Raghunath V. (2005) Isolation and characterization of an iodide bridged dimeric palladium complex in carbonylation of methanol Journal of Organometallic Chemistry, 690 (6). pp. 1677-1681. ISSN 0022-328X
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00223...
Related URL: http://dx.doi.org/10.1016/j.jorganchem.2005.01.010
Abstract
Palladium-catalyzed carbonylation of methanol in presence of iodide promoters was investigated. Iodide bridged palladium dimeric complex, [PPh3CH3]2[Pd2I6] was isolated from the carbonylation reaction mixture and characterized using X-ray crystallography. Reaction mechanism was proposed based on IR and UV spectroscopic characterizations of catalytic species involved in the catalytic cycle. The isolated dimeric palladium species, [Pd2I6]2- underwent carbonylation to give monomeric species [PdI3CO]- at atmospheric pressure of carbon monoxide. It was also observed that PPh3 plays an important role to avoid catalyst deactivation at higher temperatures. Turnover frequency (TOF) of 1052 h-1 was achieved using Pd(OAc)2-HI-PPh3 catalyst system at 175 °C.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Methanol Carbonylation; Palladium Catalyst; Dimeric Palladium; UV; IR Spectroscopy; Reaction Mechanism |
| ID Code: | 8011 |
| Deposited On: | 25 Oct 2010 09:47 |
| Last Modified: | 28 May 2011 10:30 |
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