
%0 Journal Article
%A Corrigan, PA 
%A Dickson, RS 
%A Johnson, SH 
%A Pain, GN 
%A Yeoh, M 
%T The role of binuclear rhodium complexes as possible intermediates in the formation of cyclopentadienone-rhodium complexes. Reactions between (&#951;-C<sub>5</sub>H<sub>5</sub>),Rh<sub>2</sub>(CO)(CF<sub>3</sub>C<sub>2</sub>CF<sub>3</sub>) and symmetrically disubstituted alkynes
%J Australian Journal of Chemistry
%D 1982/11/01
%V 35
%N 11
%P 2203-2214
%K 
%R https://doi.org/10.1071/CH9822203
%U https://www.publish.csiro.au/paper/CH9822203 
%X A stepwise pathway for the formation of cyclopentadienone complexes (&#951;-C5H5)Rh{C4R4CO} from (#-C5H5)Rh(CO)2 and RC&#8801;CR has been elucidated. When solutions of (&#951;-C5H5)Rh(CO)2 are heated, there is loss of CO and (&#951;-C5H5),Rh2(CO)3 is formed. This reacts with alkynes to give binuclear complexes such as (&#951;-C5H5),Rh2(CO)2(CF3C2CF3) gives (&#951;C5H5)2Rh2(CO)(ButC2But). Removal of CO from (&#951;-C5H5)2Rh2(CO)2(CF3C2CF3) gives (&#951;-C5H5)2Rh2(CO)(CF3C2CF3) and this monocarbonyl complex reacts with more alkyne, R'C&#8801;CR', to form the bis-alkyne complex (&#951;-C5H5)2Rh2(CO)(CF3C2CF3)(R'C2R')(R' = SiMe3) and then the pentadienone complex (&#951;-C5H5)2Rh2{C4(CF3)2R'2CO} (R' = =Me, Me3Si, CF3). In some instances (R' = Ph, But, CO2Me), this reaction gives equimolar amounts of the metallodiene complex (&#951;-C5H5)2Rh2{C4{CF3)2R'2} plus the dicarbonyl complex (&#951;-C5H,)2Rh2(CO)2(CF3C2CF3). The binuclear pentadienone complexes (&#951;-C5H5),Rh2{C4R2R'2CO) (R = CF, and R' = Me; or R = R' = Et) can be converted into mononuclear cyclopentadienone complexes (&#951;-C5H5)Rh{C4R2R'2CO} by heating in the presence of CO or alkyne, or both. 
