The formation of organorhodium complexes from the reaction of hexafluorobut- 2-yne and (π-C₅H₅)Rh(CO)₂

Abstract

The thermally initiated reaction of hexafluorobut-2-yne with (π-C₅H₅)Rh(CO)₂ has been studied in detail, and it is found that the nature and yields of the products are sensitive to the reaction conditions. The known complexes (π-C₅H₅)Rh-[(C₄F₆)₂CO] and (π-C₅H₅)Rh(C₄F₆)₃ and the new organorhodium complexes (π-C₅H₅)₂Rh₂(CO)₂(C₄F₆), (.π-C₅H_s)₃Rh₃(C₄F₆)₂, (π-C₅H₅)₂Rh₂(CO)(C₄F₆)₂, and (π-C₅H₅)₃Rh₃(CO)(C₄F₆) have been isolated from the reaction system. Each organorhodium complex has been characterized by elementary and mass spectral analysis, and reasonable structures for all complexes have been predicted from the appropriate i.r. and N.M.R. data. The monoalkyne complex (π-C₅H₅)₂Rh₂(CO)₂(C₄F₆) is an intermediate in the formation of the other organorhodium complexes.