An analysis of the reaction of (O)Re(Me)(DAAm), 1 , (DAAm = N,N-bis(2-arylaminoethyl)methylamine; aryl = C6F5) with CO to produce (CO)Re(OAc)(DAAm), 2 will be described. The data suggest that this transformation proceeds by two novel elementary steps that are of fundamental interests to the broader organometallic/inorganic community: a) direct insertion of CO into the rhenium methyl bond in 1 to yield the acyl intermediate, (O)Re(Ac)(DAAm), 3 , and b) 1,2-migration, in the presence of CO, of the acyl fragment in 3 to the oxo ligand, to yield 2 . Evidence is provided for the first example of an insertion reaction where CO inserts directly into a M-R bond without prior formation of a CO adduct. In addition, it will be shown that the addition of CO is necessary for the 1,2-migration of the acyl ligand. The data suggest that the addition of CO effectively weakens the Re-Cacyl bond in 3 and enables the facile migration of the acyl ligand. Figure 1. <img src='https://acs-archive-assets2.s3.amazonaws.com/240nm/uploads/44258_toc_image.jpg' alt='' />

Investigation of the mechanism for the activation of CO by oxorhenium complexes

244th National Meeting (2012)

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