Reactions of some conjugated diynes with cobalt carbonyl compounds

Abstract

Treatment of dodecacarbonyltetracobalt with the conjugated diynes RC≡CC≡CR (R = CH3, C6H5) yields complexes of stoicheiometry [Co2(CO)6]2- (RC2C2R). The same complexes are obtained from octacarbonyldicobalt and the appropriate diyne. ��� A similar type of complex was obtained from para-(C6H5C2)2C6H4 and Co4(CO)12. Surprisingly, this complex was not isolated on reaction of the diyne with Co2(CO)8. ��� The infrared, nuclear magnetic resonance, and mass spectra of the complexes are given, and the probable structures of the compounds are deduced from these spectroscopic properties.