
TY  - JOUR
A1  - Corrigan, PA 
A1  - Dickson, RS 
T1  - Reactions of Alkynes with Dicarbonyl(&#951;-cyclopentadienyl)iridium
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1979
VL  - 32
IS  - 10
SP  - 2147
EP  - 2158
KW  - 
UR  - https://doi.org/10.1071/CH9792147 
N2  - Six organometallic complexes have been isolated from the reaction between (&#951;-C5H5)Ir(C0)2 and hexafluorobut-2-yne at 120-160º. Both the cis and trans isomers of the &#963;-bridging alkyne complex (&#951; C5H5)2Ir2(CO)2(CF3C2CF3) were obtained; the cis isomer is slowly transformed to the trans isomer at 160º. These complexes do not react further with alkynes. Two other products were identified as an iridiocyclobutenone complex and a iridiocyclopentadiene complex, viz.(&#951;-C5H5){IrC(CF3)=C(CF3)CO}(CO) and (&#951;-C5H5){IrC(CF3)=C(CF3)C(CF3)}(CO)These complexes are also inert to further reaction with hexafluorobut-2-yne, and the iridiocyclopentadiene complex could not be converted into the cyclopentadienone complex (&#951;-C5H5)Ir{C4(CF3)4-CO). The spectroscopic properties of a product of formula (&#951;-C5H5)Ir(CF3C2CF3)2(C4HF5) indicate it incorporates a 1-(2',2'-difluoroethenyl)-1,2,3,4,5-pentakis(trifluoromethyl)cyclopenta-2,4-diene ligand. The final product was formulated as (&#951;-C5H5)Ir2(CO)3(CF3C2CF3)2H and five alternativestructures are consistent with the spectroscopic data. The related reaction between (&#951;-C5H5)Ir(CO)2 and but-2-yne at 180º gives a small amount of hexamethylbenzene plus the maleoyl complex(&#951;-C5H5){IrC(O)(Me=C(Me)C(O)}(CO). 
ER  -

