
TY  - JOUR
A1  - Corrigan, PA 
A1  - Dickson, RS 
T1  - The effects of bulky substituents in the reactions of alkynes with (&#951;-C<sub>5</sub>H<sub>5</sub>)M(CO)<sub>2</sub>, M = Co or Rh
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1981
VL  - 34
IS  - 7
SP  - 1401
EP  - 1411
KW  - 
UR  - https://doi.org/10.1071/CH9811401 
N2  - The reactions between (&#951;-C5H5)Co(CO)2 and MeC&#8801;CR (R = Bu, Pri) at 120&#176; gave the cyclopentadienone complexes (&#951;-C5H5)Co[C4Me2R2CO] (2) and small amounts of the p-benzoquinone complexes(&#951;-C5H5)Co[C4Me2R2(CO)2] (1); all possible isomers of both complexes were obtained. For R = But, the only products isolated were two isomers of the cyclopentadienone complex (2). The reactions between (&#951;-C5H5)Rh(CO)2 and MeC=CR at 160&#176; gave the cyclopentadienone complexes(&#951;-C5H5)Rh[C4Me2R2CO] (2), and small amounts of the p-benzoquinone complexes (&#951;-C5H5)Rh-[C4Me2R2(CO)2] (1) and of the binuclear complexes (&#951;-C5H5)2Rh2(MeC2R)2CO (3). With R = But, three isomers of (2), two isomers of (1) and three isomers of (3) were identified. The products obtained with R = Pri were three isomers of (2) and three isomers of (3). With R = But, three isomers of(2) and a very small amount of one of the isomers of (3) were separated. Comparisons of these reactions have shown that increasing the bulk of R results in a decrease in the total yields of products, a decrease in the range of products, and a change in the distribution of the isomers (M = Co only). 
ER  -

