Inter- and Intramolecular Thermal Activation of Aliphatic C–H Bonds Mediated by Complexes Containing the Fragments [{Cy2P(CH2)nPCy2}M] (n=1–4, M = Rh, Ru)
✍ Scribed by Leitner, Walter ;Six, Christian
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1997
- Tongue
- English
- Weight
- 403 KB
- Volume
- 130
- Category
- Article
- ISSN
- 0009-2940
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✦ Synopsis
A well defined geometrical structure and a well established catalytic potential for a plethora of processes puts the chelate rings [{R2P(CH2),PRz)M] (M = Rh, Ru) among the most interesting candidates for catalytic alkane functionalization in homogeneous solution. It is demonstrated that intermolecular thermal C-H activation (3 + 4) is possible with readily accessible complexes [(CyzP(CH,),PCyz)Rh(hfacac)] (n = 1-4, la-c) and [{CyzP(CH2)nPCyz)Ru(q3-C4H7)2] (n = 1-3, 2a-c) containing such fragments. A maximum of 5 catalytic cycles was achieved with complex 2a. In case of Ru complexes containing the same ligands with n = 3 and 4, intramolecular cleavage of three adjacent C-H bonds in one of the cyclohexyl substituents at phosphorus also occurs readily leading to formation of a new polydentate K2P,P',q3-allyl ligand.