Synthesis of Alkylidynetricobalt Nonacarbonyl Complexes

Another more general preparative route to such complexes was devel- 

Preparation of Alkylidynetricobalt Nonacarbonyl Complexes by Reactions of Polyhalides with Dicobalt Octacarbonyl0 

A very useful reaction for the conversion of HCCo3(CO)9 to ArC-Co3(CO)9 compounds has been developed in these laboratories (5)  

Arylmercuric halides may be used in place of diarylmercurials. Excellent yields, often 90-98%, were obtained in many cases. Table III lists some examples. Oxidative degradation studies of selected products showed that the aryl carbon atom originally attached to mercury was the one that became bonded to the apical carbon atom of the cluster. This reaction was much less useful in the preparation of alkyl derivatives, because of very long reaction times (1-2 weeks) giving at best moderate yields (Table III). The reaction of a-haloalkylmercurials with HCCo3(CO)9 occurred 

Grignaed Synthesis op Substituted Benzylidynetricobalt Nonacarbonyl Complexes prom Bromomethylidynetricobalt Nonacarbonyl0 

---