Formation of cis-[Rf(CO)Re(CO)4Hal]Na complexes as an evidence of halogen-metal exchange between [Re(CO)5]Na and polyfluorinated aryl and vinyl halides

Halo(acyl)rhenate complexes cis-[R f (CO)Re(CO) 4 Hal]Na (Hal = Cl, Br; R f = C 6 F 5 , trans-(CF 3 ) 3 CCF== CF) are the primary products of the reactions of [Re(CO) 5 ]Na with the corresponding aryl or vinyl halides R f Hal.Key words: pentacarbonylrhenate anion, carbonylmetallates, halogen-metal exchange, nucleophilic aromatic substitution, nucleophilic vinylic substitution.