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Title: Formation of Methane versus Benzene in the Reactions of (C 5 Me 5 ) 2 Th(CH 3 ) 2 with [CH 3 PPh 3 ]X (X=Cl, Br, I) Yielding Thorium‐Carbene or Thorium‐Ylide Complexes

Abstract

Abstract The reaction of (C 5 Me 5 ) 2 Th(CH 3 ) 2 with the phosphonium salts [CH 3 PPh 3 ]X (X=Cl, Br, I) was investigated. When X=Br and I, two equivalents of methane are liberated to afford (C 5 Me 5 ) 2 Th[CHPPh 3 ]X, rare terminal phosphorano‐stabilized carbenes with thorium. These complexes feature the shortest thorium–carbon bonds (≈2.30 Å) reported to date, and electronic structure calculations show some degree of multiple bonding. However, when X=Cl, only one equivalent of methane is lost with concomitant formation of benzene from an unstable phosphorus(V) intermediate, yielding (C 5 Me 5 ) 2 Th[κ 2 ‐(C,C′)‐(CH 2 )(CH 2 )PPh 2 ]Cl. Density functional theory (DFT) investigations of the reaction energy profiles for [CH 3 PPh 3 ]X, X=Cl and I showed that in the case of iodide, thermodynamics prevents the production of benzene and favors formation of the carbene.

Authors:
 [1];  [2];  [2];  [1];  [1];  [2]; ORCiD logo [1]
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  1. Department of Chemistry University of Missouri Columbia MO 65211 USA
  2. Universite de Toulouse and CNRS, INSA, UPS, CNRS, UMR, UMR 5215, LPCNO 135 Avenue de Rangueil 31077 Toulouse France
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1379993
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Angewandte Chemie (International Edition)
Additional Journal Information:
Journal Name: Angewandte Chemie (International Edition) Journal Volume: 56 Journal Issue: 42; Journal ID: ISSN 1433-7851
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Rungthanaphatsophon, Pokpong, Bathelier, Adrien, Castro, Ludovic, Behrle, Andrew C., Barnes, Charles L., Maron, Laurent, and Walensky, Justin R. Formation of Methane versus Benzene in the Reactions of (C 5 Me 5 ) 2 Th(CH 3 ) 2 with [CH 3 PPh 3 ]X (X=Cl, Br, I) Yielding Thorium‐Carbene or Thorium‐Ylide Complexes. Germany: N. p., 2017. Web. doi:10.1002/anie.201706496.
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Rungthanaphatsophon, Pokpong, Bathelier, Adrien, Castro, Ludovic, Behrle, Andrew C., Barnes, Charles L., Maron, Laurent, & Walensky, Justin R. Formation of Methane versus Benzene in the Reactions of (C 5 Me 5 ) 2 Th(CH 3 ) 2 with [CH 3 PPh 3 ]X (X=Cl, Br, I) Yielding Thorium‐Carbene or Thorium‐Ylide Complexes. Germany. https://doi.org/10.1002/anie.201706496
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Rungthanaphatsophon, Pokpong, Bathelier, Adrien, Castro, Ludovic, Behrle, Andrew C., Barnes, Charles L., Maron, Laurent, and Walensky, Justin R. Thu . "Formation of Methane versus Benzene in the Reactions of (C 5 Me 5 ) 2 Th(CH 3 ) 2 with [CH 3 PPh 3 ]X (X=Cl, Br, I) Yielding Thorium‐Carbene or Thorium‐Ylide Complexes". Germany. https://doi.org/10.1002/anie.201706496.
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@article{osti_1379993,
title = {Formation of Methane versus Benzene in the Reactions of (C 5 Me 5 ) 2 Th(CH 3 ) 2 with [CH 3 PPh 3 ]X (X=Cl, Br, I) Yielding Thorium‐Carbene or Thorium‐Ylide Complexes},
author = {Rungthanaphatsophon, Pokpong and Bathelier, Adrien and Castro, Ludovic and Behrle, Andrew C. and Barnes, Charles L. and Maron, Laurent and Walensky, Justin R.},
abstractNote = {Abstract The reaction of (C 5 Me 5 ) 2 Th(CH 3 ) 2 with the phosphonium salts [CH 3 PPh 3 ]X (X=Cl, Br, I) was investigated. When X=Br and I, two equivalents of methane are liberated to afford (C 5 Me 5 ) 2 Th[CHPPh 3 ]X, rare terminal phosphorano‐stabilized carbenes with thorium. These complexes feature the shortest thorium–carbon bonds (≈2.30 Å) reported to date, and electronic structure calculations show some degree of multiple bonding. However, when X=Cl, only one equivalent of methane is lost with concomitant formation of benzene from an unstable phosphorus(V) intermediate, yielding (C 5 Me 5 ) 2 Th[κ 2 ‐(C,C′)‐(CH 2 )(CH 2 )PPh 2 ]Cl. Density functional theory (DFT) investigations of the reaction energy profiles for [CH 3 PPh 3 ]X, X=Cl and I showed that in the case of iodide, thermodynamics prevents the production of benzene and favors formation of the carbene.},
doi = {10.1002/anie.201706496},
journal = {Angewandte Chemie (International Edition)},
number = 42,
volume = 56,
place = {Germany},
year = {Thu Sep 07 00:00:00 EDT 2017},
month = {Thu Sep 07 00:00:00 EDT 2017}
}
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https://doi.org/10.1002/anie.201706496
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