Journal of Molecular Structure, ( ISI ), No (127), Year (2009-1) , Pages (108-114)

Title : ( H-Transfer steps of the Wacker process: A DFT study )

Authors: , Hossein Eshtiagh Hosseini , Mohammad Reza Housaindokht , Ali Morsali ,

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The Wacker process involves a number of organometallic reactions, particularly the b-hydrogen elimination, 1,2-insertion and the OAH bond cleavage reactions. This work seeks to fully explore the mechanism of these H-transfer steps, employing density functional theory, and handling the solvent effects with the PCM model. This approach ruled out the simple mechanism bearing the cis and trans isomers of the reactant of the b-hydrogen elimination step. Therefore, a more improved model will be used, in which one water molecule is assumed to be in the second-coordination sphere. The water molecule will highly reduce the energy barriers of the b-hydrogen elimination and OAH bond cleavage steps. This water assisted mechanism provides two possible pathways: one bearing the –OH group positioned on the opposite side of the coordinated H2O and the other the –OH group on the next to the coordinated H2O. Involving the high energy barrier (for the last step), the first pathway is ruled out. The second pathway, in which the third step is the reductive elimination of hydrogen from the –OH group, leads to the experimentally confirmed energy barriers for these H-transfer steps. Thus, this pathway would be accepted as the most appropriate mechanism for this part of the Wacker process.

Keywords

, Wacker process; DFT; PCM; Palladium; b, Hydrogen
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@article{paperid:1010504,
author = {, and Eshtiagh Hosseini, Hossein and Housaindokht, Mohammad Reza and Ali Morsali},
title = {H-Transfer steps of the Wacker process: A DFT study},
journal = {Journal of Molecular Structure},
year = {2009},
number = {127},
month = {January},
issn = {0022-2860},
pages = {108--114},
numpages = {6},
keywords = {Wacker process; DFT; PCM; Palladium; b-Hydrogen elimination},
}

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%0 Journal Article
%T H-Transfer steps of the Wacker process: A DFT study
%A ,
%A Eshtiagh Hosseini, Hossein
%A Housaindokht, Mohammad Reza
%A Ali Morsali
%J Journal of Molecular Structure
%@ 0022-2860
%D 2009

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