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Palladium-catalysed Formation of Aroylcobalt Complexes from Iodoarene and Tetracarbonylcobaltate Anion. Syntheses, Characterization and Reactivities of Model Intermediate Complexes

DOI: 10.1039/DT9950003489

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 3489 - 3496 (1995)

Update date:2022-09-26

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Authors:

Misumi, YoshihikoMisumi, Yoshihiko

Ishii, YouichiIshii, Youichi

Hidai, MasanobuHidai, Masanobu

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Article abstract of DOI:10.1039/DT9950003489

The complex showed good catalytic activity for the formation of aroylcobalt complexes from RI (R = aryl), K and PPh3.Attempts to isolate an intermediate Pd-Co complex in this catalytic reaction were unsuccessful, however a series of heterodinuclear complexes <(Ph3P)(OC)RPtCo(CO)3(PPh3)> (R = Ph 1a, C6H4Me-4 1b or Me 1c), <(Me3P)2(PhCO)PdCo(CO)4> 2 and <(Me3P)2PhPtCo(CO)4> 3 have been prepared from reactions of (M = Pt or Pd, R' = Me or Ph) with K as model intermediate complexes.Prior to the formation of complex 1, transient formation of <(Ph3P)2RPtCo(CO)4> was confirmed by 31P NMR spectroscopy of the reaction solution.The reaction of with K led to the isolation of the corresponding Pt-Co complex 3, while the palladium analogue resulted in the formation of the CO insertion product 2.Crystal structures of compounds 1a, 1c, 2 and 3 were determined by X-ray diffraction analyses.Addition of ligands L such as CO, t-BuNC and PMe3 to 3 in tetrahydrofuran induced heterolytic cleavage of the Pt-Co bond to form .Thermolysis of complexes 1b and 1c under CO at 50 deg C resulted in reductive elimination of Co(OCC6H4Me-4)(CO)3(PPh3) and Co(OCMe)(CO)3(PPh3), respectively, from the platinum centre.This strongly suggests the involvement of this type of heterodinuclear Pd-Co complex in the catalytic formation of aroylcobalt complexes.

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Product name:[Co(C6H4Me-4)(CO)3(PPh3)]

Cas No:173274-87-8

173274-87-8

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