TY - JOUR T1 - Isolation and characterization of an iodide bridged dimeric palladium complex in carbonylation of methanol JF - Journal of Organometallic Chemistry Y1 - 2005 A1 - Tonde, S. S. A1 - Kelkar, Ashutosh A. A1 - Bhadbhade, Mohan M. A1 - Chaudhari, Raghunath V. KW - dirneric palladium KW - IR spectroscopy KW - methanol carbonylation KW - palladium catalyst KW - reaction mechanism KW - UV AB -

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 degrees C. (c) 2005 Elsevier B.V. All rights reserved.

PB - ELSEVIER SCIENCE SA CY - PO BOX 564, 1001 LAUSANNE, SWITZERLAND VL - 690 IS - 6 U3 - Foreign U4 - 2.336 ER -