Chlorure de bis(triphénylphosphine)rhodium carbonyle

Chlorure de bis(triphényl-
phosphine)rhodium carbonyle
Image illustrative de l’article Chlorure de bis(triphénylphosphine)rhodium carbonyle
Structure du chlorure de bis(triphénylphosphine)rhodium carbonyle
Identification
No CAS 13938-94-8
No ECHA 100.034.270
No CE 237-712-8
PubChem 53249302
SMILES
InChI
Apparence poudre jaune clair[1]
Propriétés chimiques
Formule C37H30Cl2OP2Rh
Masse molaire[2] 726,393 ± 0,036 g/mol
C 61,18 %, H 4,16 %, Cl 9,76 %, O 2,2 %, P 8,53 %, Rh 14,17 %,
Propriétés physiques
fusion 224 à 227 °C[1]
Précautions
SGH[1]
SGH07 : Toxique, irritant, sensibilisant, narcotique
Attention
H302+H312+H332, P280, P301+P312, P302+P352 et P304+P340
NFPA 704[1]

Symbole NFPA 704.

 
Transport[1]
-
   2811   

Unités du SI et CNTP, sauf indication contraire.

Le chlorure de bis(triphénylphosphine)rhodium carbonyle est un composé chimique de formule trans-[RhCl(CO)(P(C6H5)3)2]. Il se présente comme un solide jaune clair stable à l'air de structure analogue à celle du complexe de Vaska trans-[IrCl(CO)(PPh3)2]. Il s'agit d'un complexe de rhodium(I) de géométrie plane carrée avec deux ligands triphénylphosphine P(C6H5)3 en configuration trans pouvant être utilisé comme catalyseur homogène polyvalent[3].

Il a été obtenu à l'origine en traitant le chlorure de rhodium carbonyle [Rh(CO)2(µ-Cl)]2 avec la triphénylphosphine P(C6H5)3[4] mais est généralement produit par carbonylation du catalyseur de Wilkinson[5] RhCl(PPh3)3 :

RhCl[P(C6H5)3]3 + CO ⟶ RhCl(CO)[P(C6H5)3]2 + P(C6H5)3.

En catalyse homogène, cette conversion est généralement une réaction parasite dans la mesure où RhCl(CO)(PPh3)2 est un mauvais catalyseur d'hydrogénation.

Le chlorure de bis(triphénylphosphine)rhodium carbonyle est un précurseur de l'hydrure de tris(triphénylphosphine)rhodium carbonyle RhH(CO)(PPh3)3, important catalyseur d'hydroformylation :

RhCl(CO)[P(C6H5)3]2 + NaBH4 + P(C6H5)3RhH(CO)[P(C6H5)3]3 + NaCl + BH3.

Notes et références

  1. a b c d et e « Fiche du composé Carbonylchlorobis(triphenylphosphine)rhodium(I), Rh 14.9% min  », sur Alfa Aesar (consulté le ).
  2. Masse molaire calculée d’après « Atomic weights of the elements 2007 », sur www.chem.qmul.ac.uk.
  3. (en) Kiyoshi Kikukawa, Stephen A. Westcott, Mitchell P. Croatt, Travis J. Williams, Paul A. Wender, Yiming Li et Xuefeng Jiang, « Carbonyl(chloro)bis(triphenylphosphine)rhodium(I) », Encyclopedia of Reagents for Organic Synthesis,‎ , p. 1-22 (DOI 10.1002/047084289X.rc021.pub3, lire en ligne).
  4. (en) L. Vallarino, « 440. Carbonyl complexes of rhodium. Part I. Complexes with triarylphosphines, triarylarsines, and triarylstibines », Journal of the Chemical Society (Resumed),‎ , p. 2287-2292 (DOI 10.1039/jr9570002287, lire en ligne).
  5. (en) D. Evans, J. A. Osborn, G. Wilkinson, Robert Paine Jr et R. W. Parry, « trans-Carbonylchlorobis(Triphenyl-Phosphine)Rhodium and Related Complexes », Inorganic Syntheses: Reagents for Transition Metal Complex and Organometallic Syntheses, vol. 28,‎ , p. 79-80 (DOI 10.1002/9780470132593.ch18, lire en ligne).

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