Transition metal complexes of substituted alkynes. IV. Some bridging alkynecobalt complexes

1969 ◽  
Vol 22 (3) ◽  
pp. 533 ◽  
Author(s):  
RS Dickson ◽  
DBW Yawney
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Spectroscopic Properties ◽  
Terminal Alkynes ◽  
Nuclear Magnetic Resonance Spectra ◽  
Direct Formation ◽  
Formation Of Complexes

Two new organocobalt complexes, Co2(CO)4(CF3C2CF3)3 and Co2(CO)4(CF3C3H)2- CF3C2CF3, have been isolated from the appropriate reactions of hexafluorobut-2-yne with octacarbonyldicobalt and of 3,3,3- trifluoropropyne with μ-hexafluorobut-2-yne-hexacarbonyldicobalt. The probable structures of these compounds are discussed in light of their infrared and nuclear magnetic resonance spectra. ��� The direct formation of complexes of the type Co3(CO)9CCH2R has been established in the reactions of several terminal alkynes, RC2H (R = H, CF3, C6H5), with octacarbonyldicobalt. The spectroscopic properties of the products so obtained are given.

Transition metal complexes of substituted alkynes. II. Pentafluorophenylacetylene complexes of iron and cobalt

1968 ◽  
Vol 21 (1) ◽  
pp. 97 ◽  
Author(s):  
RS Dickson ◽  
DBW Yawney
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Cobalt Complexes ◽  
Spectroscopic Properties ◽  
Stable Complex ◽  
Structural Isomers ◽  
Nuclear Magnetic Resonance Spectra

Treatment of pentacarbonyliron with pentafluorophenylacetylene has given the stable complex tricarbonyl-2,5-bis(pentafluorophenyl)cyclopentadienoneiron. There is no evidence of the formation of other structural isomers. The complex is also formed from pentafluorophenylaoetylene and nonacarbonyldiiron or dodecacarbonyltriiron. Two alkyne-cobalt complexes have been isolated from the interaction of octacarbonyldicobalt and pentafluorophenylacetylene. One of these is a bridging alkyne complex of molecular stoicheiometry Co2(CO)6(C6F6CCH); the second is a complex of formula Co3(CO)9(CCH2C6F5). The infrared and nuclear magnetic resonance spectra of the complexes are given, and the probable structures of the compounds are deduced from these spectroscopic properties.

Transition metal complexes of substituted alkynes. X. The formation of disubstituted cyclopentadienone complexes from terminal alkynes and (η-C5H5)Co(CO)2

1973 ◽  
Vol 26 (9) ◽  
pp. 1911 ◽  
Author(s):  
RS Dickson ◽  
HP Kirsch
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Steric Effects ◽  
Terminal Alkynes ◽  
Mass Spectral Data ◽  
Mass Spectral ◽  
Electronic And Steric Effects

The reaction at 160� of dicarbonyl(η-cyclopentadienyl)cobalt with each of the terminal alkynes phenylacetylene, t-butylacetylene, propyne, and 3,3,3-trifluoropropyne has been studied. The reactions give p(disubstituted cyclopentadienone)-η-cyclopenta-dienylcobalt complexes as the major products; two or three isomers of each cyclo- pentadienonecobalt complex are formed. The arrangement of the substituents in each isomer has been assigned on the basis of electronic, infrared, nuclear magnetic resonance, and mass spectral data. Attempts to rationalize the distribution of isomers are based on considerations of electronic and steric effects.

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