
%0 Journal Article
%A Dickson, RS 
%A Tailby, GR 
%T Transition metal complexes of substituted alkynes. VII. Some cyclopentadienone complexes of cobalt and rhodium
%J Australian Journal of Chemistry
%D 1970/08/01
%V 23
%N 8
%P 1531-1544
%K 
%R https://doi.org/10.1071/CH9701531
%U https://www.publish.csiro.au/paper/CH9701531 
%X &#960;-Cyclopentadienone-&#960;-cyclopentadienyloobalt complexes have been prepared from reactions of &#960;-oyclopentadienyldicarbonylcobalt and the alkynes bis(pentafluorophenyl)acetylene and 2,3,4,5,6-pentafluorodiphenylacetylene. Spectroscopic data indicate that the complex derived from the latter alkyne has an unsymmetrical arrangement of the substituents in the cyclopentadienone ring. It is formulated as 2,4-bis(pentafluorophenyl)-3,5-diphenylcyclopentadienone-&#960;-cyclopentadienyl-cobalt. A related cyclopentadienone complex, &#960;-tetrakis(pentafluorophenyl)cyclopenta-dienone-&#960;-cyclopentadienylrhodium has been prepared from &#960;-cyclopentadienyl-dicarbonylrhodium and bis(pentafluorophenyl)acetylene. Similar organorhodium complexes could not be isolated from reactions of &#960;-C5H5Rh(CO)2 with diphenylacetylene and 2,3,4,5,6-pentafluorodiphenylacetylene. These compounds could, however, be prepared indirectly by the in situ treatment with thallous cyclopentadienide of the cyclopentadienone complexes formed in reactions of [Rh(CO)2Cl]2 with RC=CR' (R = phenyl, R' = phenyl or pentafluorophenyl). Like its cobalt analogue, &#960;-bis(pentafluorophenyl)diphenylcyclopentadienone-.&#960;-cyclopentadienyl- rhodium has an unsymmetrical arrangement of the substituents in the ring. 
